Ultimate Spell — Burn • Cost: 3
Deal 5 damage divides as you choose among any number of units, heroes, and/or buildings.
Red • Fire Ultimate Magic
You must assign at least 1 damage to each target, so you can choose at most five targets. — Sirlin, 03/03/16
If you have the Hotter Fire upgrade, Burning Volley can do a total of 6 damage. You can then divide that damage to up to six targets. — Sirlin, 03/03/16