Nexus Clash

Observed on a small child

When using Feeding Fangs on a Void Walker the Revenant gains Invisibility.

While Invisible from this effect the ability to see hidden targets via Animus of the Bat is lost. Once Invisibility is removed (in this case from attacking a door) the VW will show up again. I'm not sure if this is because I no longer own Enhanced Senses or if there's some wonky interaction happening between Animus of the Bat+Invisibility.

Sounds pretty similar to what's been talked about here: https://nexusclash.com/viewtopic.php?f=10&t=1705

Commonalities include lacking Enhanced Senses from Myrmidon tree and activating a status or otherwise trigger a change in your skills (such as through a dark pact, or gaining something through feeding fangs.)

Confirmed, there was a status loop that was negating Enhanced Senses. It'll be fixed in the next patch.