In Battle of the Immortals, one of the best spells a Shaman has not even her heal. It’s a spell called Brutal Will. Which boost your attack and increases your chance to strike multiple times during that character combat turn. 

Normally your Hero/Merc after you tell him to attack something will hit the mob between 1 to 4 times (it’s pretty random). Brutal Will boost your chance to get those lovely 3 and 4 hits. Which will absolutely destroy most mobs. Some players use Middle Row, which can consist of your SpearMan, Gunner,boi gold and Archer.

While you lose control of them for the 4 rounds they are under the effect of Brutal Will. Their damage goes up, and they pop enemies 3 and 4 times on a regular. Which is great. As Archers can hit any mob on any line and have boi money. SpearMan are capable of hitting the initial target plus one mob behind it for pretty good damage.

Gunner is the same as SpearMan except, she’ll hit all 3 mobs in the row for pretty good damage. It has its benefits for Melee, Ranged, and Casters. It has it’s draw backs though. It continuously eats life while your people are under it’s effects, and like you lose control of them for the 4 rounds it last. Which means you can’t make use of their boi gold. It’s still generally worth the trade off.