Trolls are named after the first thing they eat. In this case, Kraka most likely ate a Christmas cracker, a holiday item in RuneScape that contains partyhats. This is seemingly corroborated by the nearby Pee Hat, a troll likely named after what came out of the Christmas cracker, as "p hat" is a common slang term for a partyhat. The change in spelling of Kraka's name reflects the pronunciations used by most trolls.
Strategy
Kraka has a maximum hit of 23, so it is recommended to use Protect from Melee when fighting him. His wander range allows him to be safespotted by standing near the cliffside, although players can still be attacked by other mountain trolls while in the area.
For those without protection prayers, another way to "safespot" him is to stand near the entrance to the plateau, hit him a couple times before he turns towards you, and then walk outside the spear wall, where the thrower trolls will attack you. Players can then walk back inside and wait for Kraka to lose his aggression and walk back to his usual guard position. Attacking during his walk back allows the player to land a couple free hits before he retaliates and the player has to step outside again.
If the player is willing to wait out aggression, and the aggression zones are set up correctly, the player can use a halberd while safespotted to kill Kraka from one tile north of the gap in the spear wall.
Combat stats
Magic defence
Ranged defence
Asgarnia✓
