Censer and Incense

[Sombre]

[the following is entirely about Skaven Censer Bearers, NOT Kohen]

Yes, the secondaryeffect poison cloud is definitely improved by death bless. Unless of course you don't like afflicting/killing your own troops for some crazy unskavenlike reason.

Nature bless can help them survive the poison given off when they strike,.. but it's by no means a sure thing and nature doesn't really synergise with the unit, because it tends to die very quickly in combat due to lack of prot or high hp. The nastiest sensible bless on them offensively would be something like D6W9, or W9F9 (as always) if you don't want to rely on poison so much.