If there's a fist next to a element symbol (ice for example) does that mean I do more damage to Ice opponents, or do I do more damage while using Ice spells?
Any elemental symbol with a fist means additional damage from spells of that elemental school. For example, the spell Deathblade shows a "+ 35% *fist icon* " above you when cast"
If there's a fist next to a element symbol (ice for example) does that mean I do more damage to Ice opponents, or do I do more damage while using Ice spells?
That you will do more damage while using Ice spells.
It will say "Boost" on the Enemy if you do additional damage to the opponent (such as using a Fire spell on an Ice enemy).