If there is no limit I could think of a way to play the game in easy mode:

 

Have a party with 5 multi classed beckoners.

They are multi classed with:

1.) paladin: auras and shared devotion

2.) priest: masters of buffing and healing

3.) cipher: more spells for buff, debuff and damage

4.) wizard: even more debuff and damage spells

5.) whatever you want. Use a single class for summoning 2 dragons or maybe multi class with druid to stick to the path of more buff, debuff, healing and damage spells

 

Each of them starts with the skelleton summons. Chant fire lash, ancient memory, damage shield and whatever you want to keep your army happy.

Use the spells of the other class mostly for buffs and debuffs, your summons do most of the damage.

 

Now imagine those 5 attack a fortress:

We: Surrender or we will overrun this fortress!

enemy commander: You and what army?

We: * * * each of them summons 6 skelletons and the priest can cast "barring deaths doors" on the frontline * * *

Best thing: once you summoned 30 mini-skeletons you cast "Spark the Souls of the Righteous"...

Spank the Souls you mean.

Only if you start a fight with righteous people.