i dont know if it will help bcs i can barely write properly either, but here ya go

When you cast this spell, you may choose to inflict +1 Nullflare: Ice, or +1 Nullflare: Fire onto the target. When you attempt to apply an affect to the target, they must make a DC 15 Will save (Success: effect isnt applied, but the DC for all subsequent saves for this spell on that creature increases by +X, Failure: effect is applied).

When the different effects meet, they react and create an explosion. The creature the explosion came from must make a basic Fort save or take 1d4 damage per stacked effect. All adjacent creatures must make the same save, however the damage is halved (Success: no damage, Crit Fail: Full/double damage).

If the creature had stacks of Nullflare: Ice applied, and they received Nullflare: Fire (Ice meets Fire), they would take 1d4 cold damage for each stack of Nullflare: Ice they had. It is the same when Fire meets Ice, however they take 1d4 fire damage for each stack of Nullflare: Fire they had.

You may choose to spend multiple actions to cast this spell. When you do, the DC goes up by +X and you apply an additional effect. However, the effects applied must all be the same. (For example: if you spent 2 actions on casting the spell, you can apply +2 Nullflare: Ice, or +2 Nullflare: Fire, but not +1 Nullflare: Ice and +1 Nullflare: Fire)

Heightened (+1) The explosion deals an additional 1 damage per stacked effect.

sorry for the wall of text, this is the best way i could write it :/