How about directly drawing the 'ice nova' spell pattern on to the soul flame of the spirit guardian wizard just like the ice bolt pattern?
Abel reconnected with the spirit guardian wizard through his power of the will and drew out the pattern. However, the pattern vanished as soon as it was drawn.
Abel didn't believe in the devil playing tricks on him. He spread out his world stone's ability and began to investigate the soul flame of the spirit guardian wizard.
Soon he realized the ice bolt pattern was made up of some strange energy unique to the soul flame.
Unless someone extracted the strange energy from the ice bolt pattern and drew a new spell pattern with it, the spirit guardian wizard would be able to do so anything other than an ice bolt.
There was a chance Abel could fail, and his spirit guardian wizard would lose its only spell ability. Then he had to summon a new one, and that 100 bottles of soul potion would go to waste.
