The group im play with are currently playing a campagn of Sea of Blood and ive been thinking about picking up Tomb of ice. We are only 4 "game weeks" in. What actually is put into the campaign from the ToI expansion and would we be able to still add it without causeing to much trouble. I guess what im really asking is, would it be worth buying and adding the elements to the game?

You will get four dungeon levels (although made for RtL they are perfectly usable with SoB), one Rumor level, some nice monsters for the OL and mainly the feat cards for the heros to give them a much needed boost.

Most players regard ToI as the best expansion for Descent, so you won´t make a big blunder by getting it.

It will also fit seamlessly into your campaign, just give the starting Feat cards to the heros, add the basic spawns to the OL deck and you are good to go.