Refer to this link:
http://dom3.servegame.com/wiki/Horror
There is a hidden tag "stormimmune" which is not mentioned in Edi's DB.
BTW, the wiki contains a lot of undocumented tags like "fortunate events X"(firebird, lady of funtune), "Divine being"(angels and national sommons of Bandarlog) and "magic 1"(Lugh the Long Handed). it seems the database is extracted directly from the game files.