Obsessions are fine- provided that they are taken in moderation. Unfortunately, Clan Vruzz seems to have ignored this good rule of thumb. At first glance, they don't seem like anything special. However, there are two details that set this clan apart from the rank-and-file:
1. They enjoy poison.
2. They are completely BATSHIT insane (even by Skaven standards)!
With these details in hand, it can be inferred they are thralls to either Clan Eshin (who does use poison for certain assassination jobs) or Clan Pestilens (making others ill is their thing, so...). They could be both or neither; with such little information on them, it's hard to say.
|Clans of the Skaven|
|Great Clans:||Clan Eshin - Clan Moulder - Clan Pestilens - Clan Skryre|
|Thrall Clans:|| Clan Ektrik - Clan Feesik - Clan Fester - Clan Flem - Clan Gratzz - Clan Kreepus |
Clan Morbidus - Clan Septik - Clan Skrat - Clan Treecherik - Clan Vrrtkin
|Warlord Clans:|| Clan Carrion - Clan Corpulent - Clan Crooktail - Clan Famin - Clan Ferrik - Clan Festerlingus |
Clan Festus - Clan Gangrous - Clan Gnaw - Clan Gowjyer - Clan Grikk - Clan Gristlecrack
Clan Gritak - Clan Gritus - Clan Grutnik - Clan Jamcreermin - Clan Klaw - Clan Krik - Clan Krizzor
Clan Liskit - Clan Makris - Clan Mange - Clan Mawrrl - Clan Merkit - Clan Mordkin - Clan Mors
Clan Rictus - Clan Rikek - Clan Rikket - Clan Scruten - Clan Skab - Clan Skaul - Clan Skitr
Clan Skitterbite - Clan Skrapp - Clan Skrittlespike - Clan Skully - Clan Skurvy - Clan Skuttle
Clan Sleekit - Clan Spittle - Clan Verminus - Clan Volkn - Clan Vruzz