Endless Source - Protector's Sacred Elixir.

A holy potion brewed with Sacred Light. Splash it on the ground to gain powerful Shield of Valor: allies within the area gain +30% DMG dealt for 10 sec. Upon use, instantly restore all HP of allies within the area. On entering the area, gain a 100-stack shield that reduces DMG taken by 95% for 10 sec, cooldown 90 sec.
Endless Source Potion series share a 90-sec cooldown.
Endless Source Potion series are non-consumable.
Different potion effects can coexist (when used by different users).