Let’s come up with a monster.

Everyone is coming up with strong units... as expected. I suggest a Blind Dark Elf (blindness is just for show =) – a melee unit with a double blade. With the ability "Sense Flesh" (if there is an enemy unit nearby, intuition increases by +X, i.e., speed increases by a certain amount (depending on the balance), which would be suitable for a level 1 unit.