Note that whether or not you accept it, the books are quest items and needlessly use up inventory slots.

Unless this quest is important to you, do not accept it. These texts are quest items and remain in your inventory for the rest of the game.

There is a translation side quest where you must translate 12 ancient texts.

This is quite possible because they respawn as do other chests and hidden treasures in Legend of Dead Kel. If you end up with 100 or more of 1 of these items, you’ll use 2 inventory slots for that item. In total, you’ll need: Beachstone (12), Bearhide (9), Emberwood (14), Sailcloth (11), & Seasteel (13). They cannot be junked, sold, or placed in a stash chest. If you pick them up to excess, they will needlessly occupy inventory slots. The 5 types of construction materials are quest items. The walkthrough will specifically make note of the critical dialog. It’s easy because she is, perhaps, the most engaging character in the game. There is an achievement for being nice to her. Always choose the upper right when significant dialog is presented.

Take care of your conversation options with Captain Brattigan.

Again, these relate only to Dead Kel and are not factions in the sense we were accustomed when doing the Travelers quest line. Similarly, you'll see quests under the faction heading.

This is a hold-over from when Dead Kel was a DLC of the 360 game and had its own main quest. Instead, the primary Dead Kel quests will appear under the main quest section. You will not be able to do the game's main quest. Before you meet with Captain Brattigan, be aware that you’ll be off on an island without being able to return to the rest of the world for a while. Speak to Commodore Garrick and accept his quest- The Legend of Dead Kel. Fast travel to Rathir and go to Seafoam Tavern.

Legend of mana missable events