Wrath of the Lich King, Blizzard's newest expansion pack for World of Warcraft, brings with it a plethora of new and exciting content. New instances are a fine example of this and, in turn, Drak'Tharon Keep is a very fine example of these.
Drak'Tharon is where Arthas remained while searching for the Runeblade, Frostmourne. Situated in the midst of the Grizzly Hills, it is also where Mal'ganis encountered and informed Arthas of his impending death. Since that time, it has been taken over by the Drakkari Undead Trolls, responsible for raids and attacks on the Grizzlemaw Furbolgs.
Available from Level 74, and designed for five men (on normal or heroic), this is an instance that is both exciting and very challenging. The presence of countless dinosaurs, undead trolls and, to top it all, the Dinosaur King, means that this is a fine example of the quality of new instances introduced in the new expansion pack.
Your first encounter in this instance is Trollgore, complete with four main attacks; Corpse Explode, Consume, Crush and Infected Wound. Corpse Explode is to be avoided at all costs, so don't be near to corpses as they are re-animated to explode. Having said that, Crush will knock your tank's health right back just about every time, so be mindful of this attack, too.
Your second encounter is with Novos the Summoner who, while being strong, has fairly predictable attacks (Arcane Field, Arcane Blast, Blizzard, Frostbolt and Wrath of Misery). Provided you treat them like most casters out there, you shouldn't have too much trouble here.
Your next encounter involves the aforementioned Dinosaur King, King Dred, who can be fought just about anywhere (having no AoE). Dred will remain focused on your tank (as long as he holds agro), who you will need to keep alive and, as long as you manage threat, you shouldn't have too many problems here either. As a side note, you are advised to keep your healers out of fear range; this will just make life a little easier.
Your final encounter in this instance will be with the Prophet Tharon'ja, whose specialty is Decay Flesh (with which he'll transform you and your whole group into skeletons). You'll need Bone Armor and Touch of Life to survive this, remembering to always top off health to avoid being killed by this attack.You will then just need to hit him as hard as you can once you've reverted to normal form.
The content and creativity introduced with these four encounters will make Drak'Tharon Keep a popular, challenging and fun instance for many of the mid Level 70's characters out there.