For loot silver/gold bar you mus loot them first (before loot the coins) XD or you cant loot :<.
For get your skills go to choose your speciallity same than normal KO XD.
And some skills don't work.
I have in my assassin:
55 - assassin (spike haven't cooldown xD)
60 - explore (lvl 60 skill of explore haven't cooldown too :>)
10 - master (i tried the lvl 15 and 20 master skills but don't work :<)
Stats for assassin:
STR (not dex) and HP
Stats for Archer:
Dex and HP