Which of the Warlock creatures do you like the most?

I'll start with my favorite faction: daughters of the earth and sky (depending on who you're fighting), they fundamentally change the course of battle with the ability to speed up their units and slow down the enemy's + an unreturned attack in the case of "earthlings," if they slow down the enemy; and that's all that's needed from them until close combat, unlike most mage-archer units...
And of course, the Greater Liches – with them, you can practically complete the entire game without losses, combined with a properly developed hero, and they deal a lot of damage!