Endless Source - Protector's Sacred Elixir.

A holy potion brewed with Sacred Light. After drinking, you gain powerful Shield of Valor; self and allies within the area increase DMG dealt by 40% for 10 sec. Upon casting, restores all HP of self and allies within the area. Upon entering the area, gain a 100-stack 95% damage reduction shield for 10 sec, cooldown 90 sec.
The Endless Source potion series shares a 90 sec cooldown.
The Endless Source potion series are not consumable items.
Different potion effects can coexist at the same time (if used by different users).