According to the quest text, once he has been defeated he returns in a much milder version and is soloable for the repeatable quest, Crushing Dread. We do not have stats for this version of him as we have not killed him yet. What is below is an educated guess.
To find this mob in-game, use BACKSPACE to open the World Search window, then enter Zalkenrys (Elite) in the Search field and click "Search". Remember, the field is case-sensitive and must be entered exactly as shown.
This mob is a member of the group collectively known as Pahvalosa Guardians.
A Word About Common Drops: Every mob in the game has a chance to drop Health Potions, Mana Potions, Ammunition, Runes and Festival Items, as well as a few rarer items such as Amulet of Light. For this reason, we discourage listing them in the Known Drops section. See Common Drop Table for more information. Exception: All mobs always drop the same Production Rune and we will list it. Also see Merdhin Tundra (Zone Loot Table) for more information about common drops in this zone.