Possible user error, but Viscous Darkness does not always have a timer.

cot 5.zip

Which version of DeadlyBossMods are you using?
Core 11.0.20-19 alpha
Dungeons r160

I could not find any code issues anyways. i'll leave ticket open for now

Found the "problem". There is a timer bar, as well as an announce, but the audio countdown is disabled by default. Same thing for Dark Pulse.

For Dark Pulse, I would recommend having the countdown on by default for Healers, as it is a very heavy hitting unavoidable AOE.
For Viscous Darkness, I'll leave that decision up to you (or other player feedback). It is a knockback that also deals moderate damage.

Closing ticket as the warnings DO have a countdown audio, just off by default.