Key Bind: Passive
Every 5s, Khepri applies a shield to himself and nearby allied gods for 2% of the target's Maximum Health for 15s. The rate is slowed to every 10s if Khepri has taken or dealt damage in the last 5s. (Max 10%)SMITEFire is the place to find the perfect build guide to take your game to the next level. Learn how to play a new god, or fine tune your favorite SMITE gods’s build and strategy.
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And yes it stacks till 15% (so after 25 seconds you should reach the max) and I think it refreshes the stack (otherwise you can't hit the 15%)
and also for me it looks like the ability stacks