Teneshpar

It can't be looted and its corpse cannot be moved. It respawns where its corpse is.All players who sufficiently damage it during the last minute of the fight will receive the Slayer of Teneshpar achievement.

Retargets, retreats at low health.

Sorcerers and Druids: Glacier Set will reduce Ice Damage, but this is not necessary. You will need to heal after each hit as Teneshpar has various strong attacks, and using Magic Shield is recommendable. Heal the blocker and throw all the fire, ice, energy and earth spells you have at it.
Knights and Paladins: Since this creature is immune to Physical Damage, you'll have a hard time killing it. It's advised to throw several Fire Bombs on the floor next to each other and then make Teneshpar chase you back and forth on the middle row. Also bring some Great Fireball Runes to deal some extra damage. If the fire fields get weaker, just cover them with some new Fire Bombs. Knights and Paladins of level 130 or above killing Teneshpar during Devovorga's Essence Mini World Change should wear Firewalker Boots (PvP) to minimise the damage they take from their fields.