Siverius
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Inferno gets 3 heroes. One of them gets lost somewhere.
In my opinion, the mission ends exactly when you kill Lethos.
He is the toughest opponent here, both in terms of skills and army. After that, everything is easily defeated.
To complete the mission, you need to max out the Chaos or Summoning school of magic, as well as spellcasting.
Ideally, both characters should have this, as you will likely have to defend against 1-2 enemies with Shadi. Raeleth doesn't have an unlimited mana pool.
That's it.))