Blood Bath, before it was "merged" with Bloodrage, had a unique sound which played whenever it healed you. This sound is now unused since the rework.

I suggest using that sound again, for the same purpose as before, trigger whenever getting healed, this time with Thirst. It would be audible only to Bloodseeker only, like how it was with Blood Bath.

The sound files still exist in-game (bloodbath01 and bloodbath02).