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In normal mode, it is more of a nuisance than anything: the gargoyles have no other skills and are only Level 2, so are easily slaughtered in a single blow. Aside from that, it only resurrects the target at 25% health and no energy (the same as the player skill of the same name).
In hard mode, however, it can be very dangerous, as the gargoyles are significantly tougher and use Shield of Deflection to defend newly raised targets until they get their bearings.