I have recently started using Lord Kroak and I'm not sure about how can I pick up the units int the spell Comet's Call. It says: "pick up to D3 enemy units". My question is: I could pick the same unit multiple times? Or I have to choose different units? I think I could pick the same unit multiple times, because it doesnt specify to be different units, as other habilities such as the Legions of Nagash Deathly Invocation. Help will be apreciated and if I make some mistakes in English I apologize, it's not my mother language :3
FAQ stated that if you have choose multiple units as a target for spell\ability, they always have to be different. So, no, you cannot use Comet's Call to annihilate single target.
Here they are: https://www.warhammer-community.com/faqs/ And yeah, different targets unless the ability says something else (there are a few that do).