If you 
Smite it you get mana back. If you deal the killing blow to it you get Crest of the Ancient Golem from it.
Using Smite:
Using Smite upon the Blue Sentinel will restore a large amount of mana over 2 seconds (25% of your maximum mana). This bonus can only be claimed once per spawn.
Dealing the Killing Blow
This unit regens 25 flat mana regeneration per 5 seconds and 0.5% of their maximum mana (or energy) per second and has 10% cooldown reduction on their abilities. If slain, this buff transfers to the killer.
Gaining mana by smiting the Blue... Read More
Smite it you get mana back. If you deal the killing blow to it you get Crest of the Ancient Golem from it.Using Smite:
Using
Smite upon the Blue Sentinel will restore a large amount of mana over 2 seconds (25% of your maximum mana). This bonus can only be claimed once per spawn.Dealing the Killing Blow
This unit regens 25 flat mana regeneration per 5 seconds and 0.5% of their maximum mana (or energy) per second and has 10% cooldown reduction on their abilities. If slain, this buff transfers to the killer.
Gaining mana by smiting the Blue... Read More
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