For the RPG Pillars of Eternity II: Deadfire the huge Update 3.0 as well as the new DLC "Seeker, Slayer, Survivor" has been released for Linux on GOG and Steam.

About the DLC:

Prove your worth in the crucible of Kazuwari, where the arena's masters and their worshipers exalt the victorious and delight in the blood forfeited by the defeated. Something corrupts the spirits that dwell in the very stones of the crucible, and only you can uncover its secrets.

In this new DLC for Pillars of Eternity II: Deadfire:

Seek glory, treasure, and truth in an arena designed to test the mettle of you and your party.
Slay your way through the most challenging foes you have ever faced, both past and present.
Survive the trials and whims of the spirits and their worshipers to prove you stand above even the greatest the Deadfire has to offer.

The Changelog for the Update (Warning, contains some spoilers!):

Update 3.0 and Seeker, Slayer, Survivor DLC live now!

Patch Notes for 3.0.0 are listed below!

New Features & Updates

Seeker, Slayer, Survivor
The second DLC has the Watcher journey to the island to Kazuwari in search for some answers to a mysterious package...
New Berath's Blessings - New and exciting blessing come in to add some interesting replayability to the Deadfire:
Loaded Pockets - NPC pockets are filled with more and rarer items.
Legendary Crew - 3 Veteran Sailors become available in the Kraken's Eye tavern, they are better than normal and cheaper than normal.
Discount Craftsman - Crafting and enchanting costs are reduced.
Mythical Discovery - Start with a Mythical Adra Stone in the prologue armoire (free upgrade from Legendary → Mythic Quality)
New Ranger Abilities - Five new Ranger abilities have been added to the Ranger's arsenal of skills:
Hunter's Claw - 2 Bond Full Attack, The first target hit with this grants +1 Accuracy vs the target's Race until Rest. Subsequent hits against the same race will increase stacks (up to +20). Resting clears all stacks and allows a different race to be chosen.
Hunter's Fang - Same as Hunter's Claw, but also grants +1% Damage per stack.
Beast's Claw - Same as Hunter's Claw, but also grants +1 Defense per stack.
Bonded Fury - 3 Bond, Grants the Ranger's Animal Companion all 6 Tier 2 Inspirations, for 30s.
Heart Seeker - 4 Bond, Primary Attack (Ranged Only) Fires an unerring ranged attack that strikes all characters in a line, dealing +100% Damage with +4 Penetration and Enfeebling for 20s.
Megaboss Battles - Megabosses make their debut with the first to make their way into the game with the first boss included in the patch; The Crystal Empress! Test your mettle against one the toughest fights within the game.
Located to the West of Ondra's Mortar
Kill Camera - A new feature has been added to allow for some excitement to combat! Kill Cam will exemplify combat with key events! This feature will include options to customize how it works and can be found in the new Camera Tab of the Options Menu.
Eothas and Galawain's Challenge - Two New exciting Challenges will be coming in with this patch from Eothas and Galawain:
Eothas- The player must complete crit-path quests within a set game time or be met with a Game Over.
Galawain - Beasts now contain random buffs that are defined at the start of the game, for the duration of the game! Can you survive these dangerous new changes?
Vampiric - Heal from damage dealt
Reflecting - Reflect damage back as Raw
Unstoppable - Cannot be interrupted / Immune to Afflictions
Exalted - Gain Permanent T3 Inspiration (random)
Vengeful - Gain stacking Power Level when a friendly is killed
Accelerated - Attacks much faster
Bullish - Attacks interrupt and knock back
Hardened - Additional AR and Max HP
Prowling - Invisible (until attacks) and re-stealths if scoring a kill
Volatile - Explodes when defeated

New Community Pet - You all voted and the tallies are in! Nebula the Astral Bat is now available in game!
You can find the new pet in the Pet Seller in Periki's Outlook
Recently Used Spells - Frequently used spells are now remembered and displayed in the UI, so searching through your high list of spells should be a little easier to manage.

Resolved Major Issues

Characters no longer get stuck in an endless animation loop when using certain abilities with Two-handed weapons.
AI Options for Ghost Animal Companions now work as expected.
Many older saves that were not working previously due to conversation bundles now load as expected.
Various frame-rate fixes for players that experience drops during extended play.
The Enchanting Menu does not display when the Crafting Menu is opened.

Tekehu no longer prevents progression in the Shadows of Nekataka quest if placed in reserves.
The Ukaizo Guardian now spawns correctly when it should.
All abilities now work as expected in the Behavior Editor.
End Game Slides now work as expected when on the Atsura slide.

User Interface

Mod Manager displays correctly in the Options Menu.
The Producer's Sword shows up correctly for Mac Users.
Alcoholic Beverages no longer display missing strings.
Consumed resources for ships are displayed correctly.
Galawain timers fixed to the correct time in early sections of the game.
Adventurers in towns now show the correct data.
The conversation window is no longer obscured if opened with the ESC button during a dialog.
All interface layouts now display the UI notifications correctly.
TEMP text no longer displays for Magran's Challenge.
Menus no longer overlap in Ship Combat.

Quests

Director Castol has had his conversation fixed for typos.

Eder's reaction is no longer triggered by his own dialogue line during Burning Bridges.
Players can no longer kill the Bardatto family and make peace afterwards
Belda now holds her pistol correctly during the Bardatto Vault quest line.

Systems Updates

Full Attacks with recovery-based weapons and a firearm in offhand no longer have a 0 recovery time
Rods now deal the correct type of damage when attacking with them.
Attacking destructibles from stealth now properly removes stealth from the attacker.
Auto-Attack As Default Action toggle has been implemented to AI Behavior.
The Crookspur Vessel will no longer continuously attempt to engage retreating ships.
Druid Shift forms no longer crash the game when inventory items are moved.

All abilities will now work when using Whispers of the Endless Paths.
Lover's Embrace no longer contains typos in its stat block
Ball and Chain's "Irrepressible" efect does not activate on resisted effects.oh w
The Armor Invoice from Rowen no longer has a will keyword incorrectly.
The Drowned Kingdom now contains the correct end state if the King refuses to leave his realm.

Art & Visual Updates

Portraits display correct images when playing the game in Linux.
All Pets use the correct model that is expected.
Spiritual Weapon VFX now properly aligns with the model.
Orlans ears display correctly when wearing the Acorn Helm.

Cadhu Scath Shield now displays the right texture on the inner side.
Uto's model reflects the correct eye is missing as mentioned in his conversation.

Miscellaneous

Data is no longer carried over from previous DLC playthroughs.
Performance no longer drops when viewing Spiritshift model forms in the Inventory Screen.
Crew member models no longer spawn at the same point simultaneously.
Ikiuq Crew member now displays his correct model in game.
Loading a save after a character dies in combat no longer results in an infinite load screen for Mac users.
The default text box displays in the selected language at launch.
Combat Log displays in the language selected when changed in game.

Combat does not immediately start in the Balefire Beacon.
Chloe pet's name matches its stat block.
Xaurip Wildgards no longer get stuck when casting Wicked Briars.
End game Narrator VO no longer plays twice during one slide.