Space Marine 2 Chaos Siege: Heretic Astartes on Avarax, the 15-wave event for 100 Accolades until 3 November, and Hotfix 15.1 and 15.2 changes.<\/p>","protected":false},"author":4,"featured_media":7011,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[433],"tags":[],"blog_tag":[19],"class_list":["post-7008","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-warhammer-space-marine-2","blog_tag-patch-notes"],"acf":{"redactor":[{"acf_fc_layout":"text","text":"
Space Marine 2’s Chaos Siege Mode went live with Patch 15 on 1 October 2026, and it is free. For the first time in PvE you play as Heretic Astartes: Cultists and a Helbrute fight on your side, and Tyranids, Cadians and loyalist Space Marines come at you across a new Siege map, Hive, on Avarax. Here is what the Patch 15.0 notes<\/a> confirm, how it compares with the Siege on Kadaku, and what the notes still leave out.<\/p>\n"},{"acf_fc_layout":"text","text":" TL;DR<\/p>\n Saber started a community event for the mode on 20 October 2026. Its event post<\/a> sets one goal: “survive a total of 15 waves in Chaos Siege Mode before November 03 to unlock 100 Accolades.” The event began the day it was posted.<\/p>\n That sentence is the whole rule set. The post does not say whether the 15 waves are counted per player or for the whole community, which difficulty counts, or at what time on 3 November the event closes. “A total of” reads as waves adding up across matches rather than in one run, but the post does not confirm it, and we have not checked it in play.<\/p>\n"},{"acf_fc_layout":"title","heading":"Chaos Siege Release and Price","tag":"h2"},{"acf_fc_layout":"text","text":" Chaos Siege arrived with Patch 15 on 1 October 2026; Saber’s release post<\/a> calls it part of “Patch 15’s free update” and adds that you play “as Chaos Space Marines in PvE games for the very first time”. Season Pass 3 launched the same day with the Space Wolves Champion Pack and the Exorcists Cosmetic Pack; those are paid cosmetics, the mode is not.<\/p>\n Earlier, the June Community Update<\/a> had listed the Chaos spin-off of Siege under the free content of Year 3, which the release now matches.<\/p>\n"},{"acf_fc_layout":"title","heading":"What Is Chaos Siege Mode?","tag":"h2"},{"acf_fc_layout":"image","image":7009,"caption":"Illustration: Cultists battle amid rubble as a spiked Helbrute smashes through a burning gate.","alt":"Chaos cultists fire near ruins while a horned Helbrute crashes through a gate under smoky dusk sky."},{"acf_fc_layout":"text","text":" The Patch 15.0 notes describe it this way: players “play as Heretic Astartes in Siege mode. Supported by Cultists and even a Helbrute, players must battle against both Tyranid Hive Fleet forces and the Loyalists.” The new map, Hive, sits “somewhere in the heart of the Hive City” on Avarax, where the Heretic Astartes defend strategically vital locations and attempt their rituals.<\/p>\n Before launch, Saber’s description was one paragraph: “In this mode, you’ll play with Chaos Space Marines on a brand new Siege map located on Avarax. You’ll face Tyranids and Loyalists waves, receive the support of Chaos Cultists and Ritualists, and you’ll be able to deploy a Helbrute to wreak havoc on the battlefield.”<\/p>\n Saber’s September Community Update<\/a> (24 September 2026) adds two details. You play as Heretic Astartes “warring for the control of Avarax”, culling the Tyranid swarm while Imperial forces and Space Marines try to stop you taking the hive city. And the map has two sectors for now, with a third being worked on. The same post links a short gameplay video of a fight against the Imperial forces.<\/p>\n The June update framed it the same way: you will play “characters that were once limited to PvP only”. Until now Chaos Marines have been playable only in Eternal War, and the closest thing to a playable Helbrute was Patch 10.0<\/a>’s Helbrute Onslaught, a PvP mode.<\/p>\n"},{"acf_fc_layout":"title","heading":"Chaos Siege vs Regular Siege","tag":"h2"},{"acf_fc_layout":"text","text":" Regular Siege is the free wave mode on Kadaku; our Siege Mode guide<\/a> covers its shop, wave scaling and bosses. Side by side, the differences in Saber’s posts look like this.<\/p>\n"},{"acf_fc_layout":"table","headers":[{"header_text":""},{"header_text":"Regular Siege"},{"header_text":"Chaos Siege (Patch 15)"}],"rows":[{"cells":[{"cell_text":"You play"},{"cell_text":"Loyalist Space Marine classes"},{"cell_text":"Chaos Space Marines"}]},{"cells":[{"cell_text":"Map"},{"cell_text":"Imperial fortress on Kadaku, three rotating sectors"},{"cell_text":"New Siege map on Avarax: 2 sectors at launch, a 3rd in the works"}]},{"cells":[{"cell_text":"Enemy waves"},{"cell_text":"Tyranids and Thousand Sons"},{"cell_text":"Tyranids, Imperial forces and Space Marines"}]},{"cells":[{"cell_text":"Your support"},{"cell_text":"Summoned elite Space Marines, Cadian Troopers, a Dreadnought"},{"cell_text":"Chaos Cultists and Ritualists"}]},{"cells":[{"cell_text":"Helbrute"},{"cell_text":"Enemy"},{"cell_text":"Yours to deploy; direct control not stated"}]},{"cells":[{"cell_text":"Price"},{"cell_text":"Free"},{"cell_text":"Free, part of Patch 15"}]}],"size":"small"},{"acf_fc_layout":"text","text":" Regular Siege facts: enemies and the Helbrute from Saber’s Siege launch announcement<\/a>, reinforcements from the Patch 8.0 notes<\/a>.<\/p>\n"},{"acf_fc_layout":"title","heading":"Hotfixes 15.1 and 15.2: Hellbrute Nerf and Fixes","tag":"h2"},{"acf_fc_layout":"text","text":" Hotfix 15.1<\/a> (8 October 2026) has a Chaos Siege section of its own:<\/p>\n The notes call it the “Summonable Hellbrute”, so it is summoned rather than available from the start; they still do not say whether you control it once it is down.<\/p>\n Hotfix 15.2<\/a> (20 October 2026) adds one Chaos Siege fix: in some cases an enemy Loyalist Marine could spawn behind the closed gates, and that is fixed.<\/p>\n"},{"acf_fc_layout":"title","heading":"What the Patch 15 Notes Still Leave Out","tag":"h2"},{"acf_fc_layout":"text","text":" The notes do say Saber will take another look at Blessings and Atonements in Siege with Patch 16. Until the mode’s own systems are documented, there is no build or “best class” advice here.<\/p>\n"},{"acf_fc_layout":"title","heading":"What Else Ships in Patch 15","tag":"h2"},{"acf_fc_layout":"image","image":7010,"caption":"Illustration: Ruined Gothic archway with chains overlooks distant smoky cathedral spires at dawn.","alt":"An old stone archway partly lit by dawn light through smoke, framed by chains and banners."},{"acf_fc_layout":"text","text":" Our Take<\/p>\n Worth a run tonight, still thin on the systems behind it.<\/p>\n Holding a line as Chaos, with Cultists at your side and the Helbrute that used to charge you now charging for you, is a real change from Siege on Kadaku, and it costs nothing. Whether it lasts depends on what the notes leave out: classes, progression and rewards, and the Blessings and Atonements Saber has already promised to revisit in Patch 16. Play it for the novelty and the 100 Accolades on offer until 3 November; plan your grind around the modes that are documented.<\/p>\n<\/div>\n"},{"acf_fc_layout":"text","text":"\n
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Sources and Confidence<\/h2>\n
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\n \nClaim<\/th>\n Source<\/th>\n Status<\/th>\n<\/tr>\n<\/thead>\n \n Chaos Siege live with Patch 15 on 1 Oct 2026; Heretic Astartes with Cultists and a Helbrute against Tyranids and Loyalists; Hive map on Avarax; Patch 16 revisits Siege Blessings and Atonements<\/td>\n Saber, Patch 15.0, Steam, 1 Oct 2026<\/a><\/td>\n Official<\/td>\n<\/tr>\n \n Free update; two new Siege sectors on Avarax; Season Pass 3 packs<\/td>\n Saber, Anniversary Update II release post, Steam, 1 Oct 2026<\/a><\/td>\n Official<\/td>\n<\/tr>\n \n Patch 15 on 1 October 2026<\/td>\n Focus Entertainment on X, 12 Sep 2026<\/a><\/td>\n Official<\/td>\n<\/tr>\n \n Chaos Siege: Chaos Marines, Avarax, Tyranid and Loyalist waves, Cultists, Ritualists, Helbrute; Season Pass 3 the same day<\/td>\n Saber, August Community Update, Steam, 28 Aug 2026<\/a><\/td>\n Official<\/td>\n<\/tr>\n \n Heretic Astartes; Tyranid swarm, Imperial forces and Space Marines; 2 sectors with a 3rd in the works; heroic weapons, Wargear Sharing 2.2, Season Pass packs, Patch 16 PvP mode, Apothecary in Patch 17<\/td>\n Saber, Community Update – September, Steam, 24 Sep 2026<\/a><\/td>\n Official<\/td>\n<\/tr>\n \n Chaos Siege listed as free Year 3 content; Season Pass 3 = cosmetic DLC<\/td>\n Saber, June Community Update, Steam, 25 Jun 2026<\/a><\/td>\n Official<\/td>\n<\/tr>\n \n Regular Siege: Tyranid and Thousand Sons waves, Helbrutes as enemies<\/td>\n Saber, The Siege Update, Steam, 26 Jun 2025<\/a><\/td>\n Official<\/td>\n<\/tr>\n \n Regular Siege reinforcements: elite Space Marines, Cadian Troopers, Dreadnought<\/td>\n Patch Notes 8.0, Steam, 26 Jun 2025<\/a><\/td>\n Official<\/td>\n<\/tr>\n \n Five Year 3 updates, Patches 15 to 19<\/td>\n Saber, May Community Update, Steam, 29 May 2026<\/a><\/td>\n Official<\/td>\n<\/tr>\n \n Summonable Hellbrute melee damage \u221230%; no damage from friendly chaos portals; Loyalists better against Cultists; Chaos weapon skins fixed<\/td>\n Saber, Hotfix 15.1, Steam, 8 Oct 2026<\/a><\/td>\n Official<\/td>\n<\/tr>\n \n Loyalist Marine spawning behind closed gates in Chaos Siege fixed<\/td>\n Saber, Hotfix 15.2, Steam, 20 Oct 2026<\/a><\/td>\n Official<\/td>\n<\/tr>\n \n Community event: 15 waves in total in Chaos Siege before 3 November unlock 100 Accolades<\/td>\n Saber, Chaos on Avarax – Community Event, Steam, 20 Oct 2026<\/a><\/td>\n Official<\/td>\n<\/tr>\n \n Whether the 15 waves count per player or community-wide; difficulty; end time on 3 November<\/td>\n Not in the event post<\/td>\n Not stated<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n"},{"acf_fc_layout":"faq","items":[{"question":"When did Space Marine 2 Chaos Siege release?","answer":"On 1 October 2026, with Patch 15, the Anniversary Update II. Season Pass 3 launched the same day."},{"question":"Is Chaos Siege free?","answer":"Yes. Saber calls it part of Patch 15's free update. Season Pass 3 covers cosmetic DLC and is a separate purchase."},{"question":"Can you play as a Helbrute in Chaos Siege?","answer":"The Patch 15.0 notes say you are supported by Cultists and a Helbrute. Hotfix 15.1 calls it the \"Summonable Hellbrute\" and cut its melee damage by 30%; neither set of notes says whether you control it after summoning."},{"question":"What map is Chaos Siege played on?","answer":"A new Siege map called Hive, in the heart of the hive city on Avarax. The release post describes two new Siege sectors there, and Saber said in September that a third is being worked on."},{"question":"How is Chaos Siege different from normal Siege?","answer":"You play Chaos Space Marines on a new Avarax map instead of Loyalists on Kadaku, face the Tyranid swarm plus Imperial forces and Space Marines instead of Tyranids and Thousand Sons, and get Cultists, Ritualists and a Helbrute as support instead of Space Marines, Cadian Troopers and a Dreadnought."},{"question":"Do I need level 25 for Chaos Siege?","answer":"Not announced. The level-25 requirement Saber described belongs to Crucible Mode, not Chaos Siege."},{"question":"What is the Chaos on Avarax community event?","answer":"A Saber event that started on 20 October 2026: survive a total of 15 waves in Chaos Siege before 3 November to unlock 100 Accolades. The post does not say whether the waves count per player or across the community."}]}],"bottom":[{"acf_fc_layout":"more_articles","heading":"","posts":"","count":10},{"acf_fc_layout":"chat","heading":""}],"meta_description":"Space Marine 2 Chaos Siege: Heretic Astartes on Avarax, the 15-wave event for 100 Accolades until 3 November, and Hotfix 15.1 and 15.2 changes."},"_links":{"self":[{"href":"https:\/\/neonsect.com\/es\/wp-json\/wp\/v2\/posts\/7008","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/neonsect.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/neonsect.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/neonsect.com\/es\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/neonsect.com\/es\/wp-json\/wp\/v2\/comments?post=7008"}],"version-history":[{"count":5,"href":"https:\/\/neonsect.com\/es\/wp-json\/wp\/v2\/posts\/7008\/revisions"}],"predecessor-version":[{"id":7882,"href":"https:\/\/neonsect.com\/es\/wp-json\/wp\/v2\/posts\/7008\/revisions\/7882"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/neonsect.com\/es\/wp-json\/wp\/v2\/media\/7011"}],"wp:attachment":[{"href":"https:\/\/neonsect.com\/es\/wp-json\/wp\/v2\/media?parent=7008"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/neonsect.com\/es\/wp-json\/wp\/v2\/categories?post=7008"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/neonsect.com\/es\/wp-json\/wp\/v2\/tags?post=7008"},{"taxonomy":"blog_tag","embeddable":true,"href":"https:\/\/neonsect.com\/es\/wp-json\/wp\/v2\/blog_tag?post=7008"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}