[RDespair]

I find it amusing that you're complaining that Ice Shards is too powerful and yet you're a Brigand. Rogue has Throwing Knives which is similar to Ice Shard except it:

1-doesn't have instant recharge speed (although it is fairly quick to recharge)
2-has a drastically lower energy cost
3-requires fewer skill points to max
4-is considered a weapon and so can be drastically improved by anything that adds flat damage to your weapons (aside from stuff that's in your hands) or other effects.

Seriously, get a relic and rings that add some flat damage (preferrably piercing since Flurry of Knives gives a big +% Piercing Damage bonus), max out Art of the Hunt, Exploit Weakness, Anatomy, Blade Honing, and the Envenom Line and you've got a skill that's cheap, has low recharge, does fantastic damage (remember at max+4 level, it shoots 9 blades each of which can hit the same target if you're close enough), and can even add status effects (like the Envenom Weapon line or various effects you get from your equipment). And if you manage to get -100% Recharge equipment & +Casting Speed Equipment, then Throwing Knives is substantially better than Ice Shards ever will be.

Anyway, although I agree that Ice Shards is a powerful skill, I don't think it needs to be nerfed. The problem with your little 2-party group isn't that Ice Shards is too powerful, it's that trying to kill with slow DoT effects when you've got a big damage dealer as your partner means that you're not working together as a team. If I had a big damage dealer as my partner, I'd either go a support route (weaken enemies and strengthen my partner), a tanking route (distract the enemies and protect my partner while she kills them), or do the same thing as her and go with another big damage dealer build.

EDIT: And though I agree that poison could use some boosting, making Envenom Weapon an aura that affects allies would make it way too powerful, if only for the fact that you could have Nightshade & Mandrake enhanced summons.