Hint of the truth

What would a person do in a fight with an expert? Would they train before the battle could ever start, learn of their skill and way of doing? Some people tend to prepare the greatest set of items and weaponry but there's a better option. In a fight that takes the life of the loser, you must bring forth a cheat-like power. You should bring a gun to a knife fight, for me I brought something equivalent to a nuke

"I call upon the wrath of Zeus!!!" He sacrifices the sacred power he collected and he activates the true form of his spell. Instead of a manifestation of lightning appearing in his hands, it conjures up a storm. The stormy clouds covered the entire field and it goes to flicker with a horrifying glow that shows the sign of impending doom

[System: The request has been confirmed... The amount of [Sacred power] matches the required power to activate the spell!!!

Outcome: The player's spell has been temporarily converted from [Thunder manifestation] -> [Wrath of Zeus]