As part of the 'test' to enter the Bhaal Temple, the Farslayer of Bhaal Ghislev surprises the party with a combat encounter. He begins casting a ritual spell to kill the party after a certain number of turns, and his minions (including Zeironymous) appear and attack the party as they attempt to cross the bridge to stop Ghislev.
Throw a shard of ice that deals 1d10Piercing damage. It explodes and deals 2d6Cold damage to anyone nearby. It leaves an Ice surface. On miss, the shard of ice still explodes.