Punscho

I tested it earlier tonight offhand only on a Blasted lands mob and I got back to back procs. So at least for melee there is no cooldown.

I also duelled with it and it seems there are no diminishing returns for pvp.

It is also not a labelled debuff so it's not dispellable.

6/21 22:36:40.093 SPELL_DAMAGE,0x00000000001F4D62,"Edina",0x511,0xF130001DF409B1C4,"Servant of Razelikh",0x10a48,46579,"Deathfrost",0x10,153,16,0,0,0,nil,nil,nil
6/21 22:36:40.437 SPELL_AURA_APPLIED,0x0000000000000000,nil,0x80000000,0xF130001DF409B1C4,"Servant of Razelikh",0x10a48,46629,"Deathfrost",0x10,DEBUFF
6/21 22:36:41.000 SPELL_DAMAGE,0x00000000001F4D62,"Edina",0x511,0xF130001DF409B1C4,"Servant of Razelikh",0x10a48,46579,"Deathfrost",0x10,153,16,0,0,0,nil,nil,nil
6/21 22:36:49.281 SPELL_AURA_REMOVED,0x0000000000000000,nil,0x80000000,0xF130001DF409B1C4,"Servant of Razelikh",0x10a48,46629,"Deathfrost",0x10,DEBUFF