Temporary post till Ram updates the main post:
Patch 0.7.4.0 has released which makes the mod compatible with GD patch 1.2, and a whole bunch of adjustments.
For the links:
And the changelog:
Instructions are as always: extract the 7z file, and than drag and drop the ReignOfTerror folder into your Grim Dawn/mod folder.
Character which you have opened in 1.2 prior to this patch and had an issue with regarding enemies not attacking, thats unfortunately an issue which isnt fixed. If you have a backup of that character, you can replace it that way. Else try resetting factions or recreating it through GDstash.