ALL Upgrades, Puzzles, & Quests in the Endless Archive - Portals to the Unknown - ESO

This guide will explain the puzzles found in the Portals to the Unknown at the end of trash mob stages in the Endless Archive. Not only will you get some tips and tricks for beating them, but we will highlight the archive upgrades you can get by completing their achievements! Whether you’re looking to get an extra thread, or confused with what to do in the filers wing, you’ll find it all here!

Treacherous Crossing - Tentaclur Motivation
Haefal’s Butchery - Sweeter Deal
Filer’s Wing - Filer Kor’s Truesight
Echoing Den - Ghostly Gratitude
Theatre of War - Aramril’s Training
Destozuno’s Library - Destozuno’s Safety Net

❗️On Dec 18th, ZOS is changing the name of the Endless Archive to the Infinite Archive ❗️

TIMESTAMPS:
00:00 - Intro
00:10 - What/Where are Portals to the Unknown?
00:46 - What do you get for winning?
GAMES:
00:59 - Treacherous Crossing
01:48 - Haefal's Butchery
02:42 - Filer's Wing
04:17 - Echoing Den
05:11 - Theatre of War
06:03 - What if I lose?
06:11 - What puzzles do I see in a group?
06:25 - Archive Quests - Destozuno's Safety Net
06:52 - A Bookbinder's Bind
07:07 - Restoring the Resurrected
07:41 - 5 Threads in a Duo, but won't take effect during an active run
08:00 - Upgrades are account-wide, one-time collectibles
08:09 - Restorer of Theories Daily - Destozuno's Library


Archival fortunes, archive upgrades, filer tezurs, archive puzzles, extra thread, ea upgrades, eso