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For the inferno attack to trigger frequently, you need high soldier's luck; I've heard it affects the inferno chance. But I think it all depends on the map. If there are ambushes with centaurs, goblins, or orcs, I think the orc has a better chance, although Deleb is a special case. But I haven't lost to Deleb with orcs yet, and in the early game against a demon, the main thing is to position the warriors correctly before the battle, and Deleb's 1/3 ability will fail when we have very strong warmongers, plus there might be a tent, and the orc's level will likely be higher, as on maps with libraries that give magic, the orc gets experience while the demon gets magic.