gouge - no mana blind, replaces one attack
taunt - kind of like that bard song that brings mobs in from the next room, if it is done in the same room, have it be an opened that decreases the mobs tohit for 2-3 rounds till the mob can recompose itself, doubt that aspect of it would be used much but who knows
dual wield - wield 2 piercing weapons in exchange for not wearing a shield, would give thief 4 melee attacks, 2 per item wielded, could also have a small percentage chance of hitting with both blades on a circle stab
disarm - knock that bolt out of zeus's hand, when he is not in combat, so that you can steal it and sell it
poison resistance - due to their masery of poisons, they have built up a natural immuinty to most poisons and at least have improved savings spells here, if not an outright immunity
deflect - very limited instance of parry that is sort of like the mage spell shield thingy, when on it will occasionally let the thief use his natural dexterity to redirect a blow aimed at him, but it will have a chance of hitting someone in his group.