Dungeons
- Fang Lair
- Lizabet Charnis will no longer reset when a combat pet lands a killing blow on a monster.
World Bosses
- Haeliata and Nagravia
- Fixed an issue where the gryphon world bosses would sometimes fail to spawn.
Cloudrest Trial
- Fixed an issue where the Shade of Z'Maja's Baneful Mark ability would not apply when standing in certain sections of the world.
Writs
- The unreleased Welkynar Motif will no longer be a Master Writ requirement.
Performance
- Fixed a crash that would occur during Cyrodiil Keep destruction.
- Fixed a crash caused by loading mounts during a load screen, most commonly when loading into a Keep.
- Fixed a crash from loading multiple character animations with the same Personality equipped.
- Fixed a crash from textures being applied at the wrong time on some assets, most commonly in post-Morrowind content.
- Fixed an occasional animation memory threading crash.
- Fixed an occasional crash when loading lights or while previewing/placing furniture or pets.
- Fixed an issue where your game could crash when loading some fixtures.
Guilds
- Fixed an issue where you could see Guild Trader bids without the proper permissions under certain circumstances.
Source: https://forums.elderscrollsonline.com/en/discussion/425699/pc-mac-patch-notes-v4-0-12