Some factions (Skaven confirmed, potentially others) have a bug in this mod where caster heroes have no access to their spell list. After some investigating, I found that the "summoner heroes" component of the mod sneakily replaces some normal garrison heroes with "clone" versions that have their associated hero skills and summons.

The clone versions were not added to any relevant unit sets that can add spells - and so not only did they not get the additional spells they were supposed to from this mod, they were unable to cast spells entirely. I think this might have slipped through the cracks with most factions lacking heroes that were designated both summoners and spellcasters.

As for the fix:
needs to be added to the unit set in unit_set_to_unit_junctions_tables

There might be a few other factions (I believe Drycha's branchwraiths) that this applies to, but I haven't gone through and taken the time to verify them. Drycha can go suck on a branch anyway.


**EDIT**
Well, might as well finish the job. More for unit_set_to_unit_junctions_tables:

Vampire Coast: Vampire (Death)
vampire_garrison_clone | wh_main_vmp_cha_vampire_0

Wargrove of Woe: Malevolent Branchwraith (Beasts
mal_branchwraith_beasts_clone | wh2_dlc16_wef_cha_malicious_branchwraith_beasts_0