The Archdevil does not summon. Auto-translated

I've been playing Heroes 5 recently. I finished the first campaign and now I'm playing on the "Underground Treasures" map, and I've noticed something. Archdevils are different from devils in that they can summon cave lords, right? BUT, my archdevils can't summon anyone. When the archdevil unit is active, its special ability doesn't even appear in the window (in the lower right corner). The game is a licensed version, and patch 1.2 is installed. Has anyone else encountered this?

He can only summon Lords by raising the corpses of your army.

that's how it says... thanks for the answer.

and in the previous Heroes games, the Archdevil could summon creatures just like that, without needing corpses.

Actually, I don't really know how to use gating.

Closing the topic, the answer has been given.