There are many different elements that you may cast,

 

Only One

at a time. 

There are enemies that showcase their element, they have

 

Only One

weakness. 

There are spells you know what can effect the enemies around you,

 

Only One

is the key, the rest will fail you. 

Fire Elemental

Cast                  Idel                  Death

Water Elemental

Cast                  Idel                  Death

Earth Elemental

Cast                  Idel                  Death

Lighting Elemental

Cast                  Idel                  Death