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This skill is similar to Offering of Blood; except that the sacrifice is conditional, smaller, and in return for less energy gain.
Spirit Siphon is a better alternative since it nets you the same / more energy within the same time frame with its short recharge and it is not an elite skill. The only differences between these two skills is that Offering of Spirit will net you the energy gain regardless if there is any spirit in range whilst Spirit Siphon does not.
Energy gain[ | ]
This presumes Offering of Spirit is cast as often as possible (activation + recharge time) before any activation/recharge time modifiers.