From The Heroes of Might and Magic III wiki

Town: Tower

	Attack Skill	4	Damage	1-2
	Defense Skill	4	Health	4
	Speed	5	Shots	8
	Growth	16	Cost	40 gold
Special: Ranged Attacker

[edit] Dwelling

Master Gremlin is recruited in Upg. Workshop.

[edit] Upgrading

This is the upgraded version of Gremlin.

[edit] Description

Gremlins are indentured to menial labor around a Tower. While they are not great warriors by any standard, they are numerous and willing. Master Gremlins-- those who have proven their loyalty-- are cut from their balls and chains and are able to hurl them in a ranged attack.

The only standard level 1 shooter in the game, which makes it a bit special.

[edit] Strategy

Since they are numerous and available fast, they are great for taking out monsters guarding mines early in the game. Since they are a bit slow, use Haste if you got it. Also the AI seems to take priority of master gremlins.