What is everyone's favourite boss mechanic?
Include even bosses from other games.
Personally, I haven't played all that many games. But I've always liked the traditional Tank and Spank setups such as ToD and LoB, but I always liked having multiple different things you had to do while someone was tanking as well. So basically the whole of LoB is my personal favourite. ToD comes in second because of the constant waves that have to be dealt with, and the second boss that has to be killed requiring the party to split up.