Arcane Literacy - EXTREMELY useful, everyone should take this. 75% chance of saving a misread scroll. Cheap too.

Getaway - Helpful as well, mild cost - lot less "PANIC YOU CAN'T ESCAPE" echoes infront of guardians.

Slippery - Bugged right now, don't take it until you see the bugboard fix.

Strongarm Backstabs - you can get some neat echoes with these backstabs like a spinebreaker effect (backstab+knife anyone?) or bleeding. I hardly missed at hero, but I had usually 50 hitroll.