Herald Of Plague Bug

Upgraded Herald of Plague in Vaal Temple to 3 Sockets and can no longer activate it. Says not useable with current Weapon set settings. Using a bow.

Also get same message concerning herald of plague but mine was fine at 2 and 3 sockets with bows. It became unuseable when I swapped to an upgraded artillery bow.

also having this issue with druid the only way it works again is if you make a new spirit gem and hope it doesnt get bugged. thats whats been working for me. im on my third herald of ash

Was working with bow (pathfinder) and got bugged when I equipped Wind Dancer :/
EDIT: seems like only in town

Mine got an issue, too. Happened when in a hideout, still can't fix
Can't use Herald Of Plague after remove it's "clarity2" support gem
the tooltip says : Not usable with current weapon set settings
weird, i never use weapon set stuff

can't re-activate it in any way

Edit : Fixed via remove your secondary weapon then remove all support gems in your punch skill(or native secondary weapon skill)

Same issue here .
not much it add, just here to bump :)
- Partfinder

There is a quick fix.

after talking to some other people.

Herald of Plague have a bug it Uncheck both Weapon Set.

Click arrow next to skill and check what weapon set is being used.