Spell Rainbow

Spell Rainbow is a Spell Combinatorics technique that can be used to cast several spells at the same time. This requires the user to store the spell into a Latent Spell, and then continue to fire different spells into it until it can be triggered by stopping to focus on keeping it formed. If a magic user is sufficiently distracted, the latent spells will be cast as a weaker version of themselves.

Strengths
This can be a very powerful spell due to it becoming increasingly hard to defend against the more different spells can be mixed into the same rainbow explosion. For example, a Super II Spell Rainbow will allow the user to cast 4 spells at the same time - if those spells are Ice Spike, Fireball, Lightning Bolt and Tornado Whip all cast at the same time, it would be nearly impossible for beginners to defend with Ice Shield, Flame Cloak, Electrical Grounding and Air Shuffle all at the same time.

This is the perfect spell for both mass destruction, dueling and mass repair.

Weaknesses
This power does not come without its weaknesses, which if not sufficiently overcome, can make Spell Rainbow unusable in combat, or simply cost too much mental power to do anything significant with.

Firstly, its weakness is that it requires charge-up time, which can be difficult to use in combat. If the magic user is not sufficiently able to multitask between building up the spell and defending themselves, they can lose the Spell Rainbow due to Spell Interruption. This causes all the latent spells to be cast prematurely, and as a weaker version of themselves.

Secondly, it requires more Mental Energy to create a Spell Rainbow than it does to cast the spells individually. This is because it requires a lot of switching between different spells, which requires a good Mental Flow.

Thirdly, Spell Rainbow can be dangerous to the user due to the mechanics of Latent Spell Casting. For example, creating multiple latent explosions in the combo and forgetting to move away from it can cause the user to get hurt by their own spell.