dnaop-wr
Auto-translated
The option with Thunder of the Titans and an inaccessible cell for the Efreet was the first thing that came to mind.
The second option: a level 108 Tazar and a Potion of Life. With this setup, any number of any creatures will deal 1 damage. The Efreet should be able to handle it on its own. I haven't tested this option in practice, but in theory, it should work. If you calculate how much time this battle will actually take, the Efreet will most likely die of old age.
The third option: If this is allowed, the dragons should be in the city, but without towers. We use Mullich and artifacts to gain speed and push against the gates. We also take a cannon and a cart with us. The hero must have the skill to control the catapult so that it doesn't destroy the walls.
The Potion of Life – something is wrong here. I took it as a backup when I had about 4 Crystal shards left in the slot – I decided to test it in melee combat (the hero wasn't actually level 108 Tazar, but had 99 defense). The potion added health, but after the round, there was very little left – it seems like 8 HP, and the regeneration isn't immediately 100%, but only after 2 or 3 rounds.
But the third option seems the most realistic to me.
I actually didn't bother and used the 4th option.
Техника в руках индейца мертва.
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html