01
Official progression changes
- Act 8 is free and part of natural progression.
- Defeat Odin in Act 8 to unlock Act 9: Ebontharn.
- After Normal, unlocked waypoints remain available in Nightmare.
- Nightmare is positioned around the old Hell 1 level, Hell around the old Hell 4.5 level, then Inferno.
- Marauder, Plague Doctor, Shield Lancer and Jötunn are part of the base game.
02
What Act 9 adds
The official announcement describes a new Ebontharn campaign, side zones and the Uber bosses Phantom Leviathan, Captain Grimtide and Blood Maiden. It also introduces 24 unique items and the Abyssal Chest seasonal mechanic.
03
Re-check old build assumptions
| System | Season 10 signal | Player action |
|---|---|---|
| Ether | More than 100 new nodes; mechanics can be guaranteed with enough investment. | Re-read the live tree before copying a Season 9 path. |
| Incarnation | More than 600 new nodes. | Record the branch that solves the current constraint. |
| Market | Filters reworked. | Build comparisons from current listings. |
| Odyssey | Buffs work offline. | Do not assume old online-only behavior. |
| Zone generation | Generation received major changes. | Use route relationships, not fixed screenshots. |
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Questions players ask
How do I unlock Ebontharn?
Defeat Odin in Act 8; the official Season 10 announcement identifies that as the Act 9 unlock.
Is Act 8 paid DLC in Season 10?
No. The official update states that Act 8 moved into the base game and natural progression.
SRC
Source ledger
Sources support the page at different confidence levels; community detail is labelled in the visible guide.
Hero Siege on SteamGame identity, features and current store capabilities.↗Season 10: EbontharnOfficial Act 9, difficulty and seasonal-system changes.↗Official community wikiSystem terminology; totals are treated as patch-sensitive.↗