Diluvio = Deluge (Water?)
Ardor = Warmth (Fire?)
Procella = Tempest (Wind?)
Terremotus = Earthquake (Earth?)
Serpens = Snake (Poison?)
I guess EM stands for Elemental Master
https://www.divine-pride.net/database/npc/36899/
Verkhasel
https://ragnarok.gamepedia.com/Berkessel
Doomk is mentioned in Shadow Handicraft description.
https://www.divine-pride.net/database/item/5750/shadow-handicraft-1
Shadow Handicraft [1]
A mini crown which is made at Shadow Artworks. Masterpiece of the designer Doomk.
Int +1, Agi +1, Mdef +1.
When pure Agi is 120, Atk +10, Flee +3.
Class : Headgear
Defense : 12
Location: Upper
Weight : 10
Required Level : 100
Jobs : Shadow Chaser