I suggest giving Erebus (he's a faceless one) a specialization with invisibility. There might be problems with the model of a faceless one, but an icon is definitely possible. According to the lore, he was involved in ambushes, traps, etc., which is a perfect fit.
Added 1 minute ago
Gerter*the pack you uploaded is closed; well, more precisely, it says I don't have access to it.
Added 8 hours 43 minutes ago
I re-uploaded the main pack again – I removed some unnecessary code from the initial loading; I added the hero models from the global map directly into the mod, which might help if there was a problem with "invisible" heroes.