EDIT: Delve was actually tier 6, not 5.

Transcriptor log
skittering breach shadow realm tier 5.zip

Which version of DeadlyBossMods are you using?
Core 11.0.29 release
Dungeons r170 release

Additional context
Did this on a tier 6 so data may not be useful. I don't see anyone doing this on a tier 8 or higher because the gimmick of this story and delve boss is literally "What if the whole screen was black and you can't see anything, including mechanics?"

what's context of report? any missing timers or alerts, any errors?

The final boss of the delve gave the error that the boss was not supported.