Merlkin can be very tricky because they can spam you with attacks and walk away. They will try to keep a short distance from you, but they are easy to catch since they do not run very fast. They can move items that are in their way and Retarget. They have the ability to bring down even a high level player.
The Merlkin are the magic users of the apes. They can best be described by being some kind of primitive witch doctor. Considering the fact that those apes raid the human settlements to steal their tools, it is very likely that they have also stolen their knowledge about magic. Their ability to wield magic hints at a greater intelligence than that of their cousins (the Sibang and the Kongra) with whom they seem to live in an uneasy peace. Still, the Merlkins work together with the other ape races and their strange magic combined with the skills of the others form very effective attack forces. After the christmas update 2008, the merlkin could be seldom much stronger, so take care!
Always kill the Merlkins in a group of apes first, since they can do the most damage, and can spam you with distance attacks. Knights should drive it in a corner and kill it with a two-handed weapon. Other vocations should use Bolts, Icicle runes, or Avalanches to kill them fast.