Trial of the Crusader is a raid whose entrance is located in Icecrown in the World of Warcraft game. The minimum level for this dungeon is 80. The instance was released in the Wrath of the Lich King expansion. The raid contains 5 bosses. The end boss of Trial of the Crusader is Anub`Arak.
This is the ten or twenty five man raid that is located in the Argent Crusade in the north eastern edge of Icecrown. The entrance location is at coordinates 75, 21. It is meant as a training ground for killing Lich King.
The first boss is Northrend Beasts which is a series of beasts, the first being a Magnataur, a giant woolly mammoth creature. During the fight, Snobols (winter kobolds) will spawn and jump on players which if you're not doing the achievement need to be killed. The next is a Yeti. If you fail at one, you fail at both and have to restart again. The Yeti will target a player and rush at him so when you've been targeted, you need to move out the way or you'll be damaged or killed.
Jaraxxus will summon multi-armed female avatars which will need to be killed or kitted depending if you are on the achievement or not. He will also cause volcanoes to appear which need to be destroyed but are not part of the achievement, only the avatars are.
The faction champions are supposed to emulate players and therefore can't be kitted. The first one you need to kill are the healers which are the druid tree first and then whatever if the other at the time. If you are Alliance, you will face Horde characters and vice versa. You won't be playing against other real players so no need for PVP gear on this one, its still a raid.
This is not one but two bosses, Valkyrs which need to be taken down at the same time. There are two buffs you can get, a black buff and a white buff and they determine which of the two bosses you need to kill. During the fight mini-portals will appear and you need to switch your buff accordingly.
The final boss is Anub'arak who all the players should make sure that they are in the arena before you start as the walls go up to prevent anyone getting in or out. Anub'arak will occassionally bury himself under ground and spear the ground, hitting people. Whilst he's under ground, you need to make sure you don't get speared.