Manuals for playing as Dungeon

Once magical resistance kicks in, the chaos spell will be deflected. And that's it – a turn is lost, mana is lost, and possibly a unit is defeated.

If it's not a secret, where have you seen a Warlock's attack spell being deflected? :eek:
The special feature of Irresistible is that it always deals damage, bypassing all immunities and resistances. With a Skilled Irresistible, 50% of the damage is guaranteed to any unit with any resistance or immunity (excluding Obsidian Golems), and with the Amulet of Mastery, it's 75%.
For your information, the Warlock's Hornet Swarm spell even affects undead, bypassing their immunity to this spell. ;)