In Seahaven, talk to Feydwer and Klaars and tell them you have a code for them. You'll need a master code, plus a content code for each item.
||Bolt Flingers (gloves)
||Malignant Force (bow)
||Teasha's Ire (katana)
||Traveler's Handbook (trinket)
Free items from Klaus:
Enter OGIAOLGCDMOEHLHA as a code and talk to Klars in Seahaven. This unlocks the context input to get free items.
When you finish clearing an area and don't feel like walking all the way back out, just save your game and reload. You'll start out at the entrance.
Thanks to Revolution Reader sebelthazarius!