Hey, just reading kroaks rules again... If his spell is ever lost, forgotten, swapped, or stolen by any means, lord Kroak will immediately remember it again... Does that mean you could swap, say earth blood, from another slann so he re-remembers deliverance and therefore knows 2 spells? No where does it say he must only ever have one spell, rather it says he always remembers it again.. What do you think
Sounds right, if you could swap spells on Lord Kroak in the first place, which you can't. It requires the Telepathic Confabulations, which Kroak does not have, nor have access to. Otherwise, you'd also have been able to give spells to skinks, which is also impossible.
Not sure if any such thing exists, but if anyone can feasibly trade spells with other casters, the wording really is "You get to keep both, and the enemy forgets deliverance" Can't think of any, but I am not overly familiar with WoC or DoC, the armies most likely to have some sort of magic shenanigans to mess with spells in such a way.