Heroes 5.5 WarGame Edition - Tactical Edition.

The thing is, Nimue's specialization is "gating," meaning overwhelming with sheer numbers. It's the most combat-focused specialization of them all. Although, if it weren't for the standards, visually, I'd like to see him leading demons (imps).

Added 3 minutes later

Arnel is dead.
Erazial could take Alastor's icon. According to the lore, he is alive.

Honestly, this is absolutely not important. If we follow the tradition of continuing the campaign, then Godric should have been killed as well. Otherwise, we won't have enough new heroes.