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Well, I like to consider everything and for all cases, and it's not worth comparing single-player and multiplayer – I agree – thanks for the clarification, otherwise I would have continued to doubt this mod.
Making two mods is logical, but I don't really want to deal with them – it's better to have one version that will be suitable for multiplayer.
So: we have stronger banshees with a shriek and a fear attack, and a herald – tougher, but with a terrible presence and a grasp, the question is – are they equal? If not, then you can give each of them one additional skill and balance them out.
In my opinion:
Terrible presence + Grasp > Fear attack + Shriek
If you give the herald an aura, then what about the Banshees...? (or maybe let them all reduce defense by 1, like the Ghost did)