$an4es
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Well, firstly, what's the point of a manual then? Everything is clearly and understandably written there:
This creature can heal and resurrect Ents once per battle and receive the same healing from them (an activated ability).
A group of Ents receives 4 health points for each Nymph, and a group of Nymphs receives 20 health points for each Ent.
Just in case: any Ents can be used for resurrection.