From The Heroes of Might and Magic III wiki

Town: Castle

	Attack Skill	20	Damage	50
	Defense Skill	20	Health	200
	Speed	12	Shots	0
	Growth	1	Cost	3000 gold + 1 gem (Later versions only)
Special: Hates Devils

[edit] Description

With great offensive and defensive power and flying abiliy, Angels are among the mightiest creatures in the game.

[edit] Dwelling

Angels are recruited from Portals of Glory, and can be found in Griffin Conservatories on the Adventure map.

[edit] Upgrading

Angels can be upgraded to Archangels for 2000 gold and 2 gems per Angel.