Deep Wounds Weak Aura

[Topseykrets]

Basically, Im looking for a weak aura that will give me a 15 sec timer each time that I use the Thunder Clap ability. I want this to help me track when to refresh deep wounds when doing AOE dps.3

[pnutbutter]

Trigger > Event > Combat Log > Spell, Cast Success, Thunder Clap, player
Duration > Timed, 15