League of Legends Blue Sentinel
The Blue Sentinel is a large neutral monster on Summoner's Rift. In terms of statistics, it is nearly identical to the Ancient Golem, which was the predecessor of the Blue Sentinel . It is accompanied by two Sentries. When slain, its killer gains a buff called Crest of Insight , lasting for 2 minutes, which greatly increases mana regeneration, energy regeneration and cooldown reduction. When the holder of the buff is killed by another champion, that champion gains the buff and the duration resets.
Info from LoLWiki
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