Tavan's Limit Break

You touch a willing creature and choose one ability. For the duration of the spell, whenever the creature rolls on that ability check and rolls below its ability score, it can use its ability score for the roll instead. The modifiers for the ability apply as usual.

Dust from a different gem is needed for each ability: ruby dust for strength, emerald dust for dexterity, diamond dust for constition, sapphire dust for intelligence, topaz dust for wisdom and amethyst dust for charisma.

A creature can be affected by only one instance of Limit Break at the same time.

At Higher Levels. When you cast this spell using a spell slot of 7th level, the spell duration increases to 6 hours. When you use a spell slot of 8th level, the spell duration increases to 12 hours and when you use a spell slot of 9th level, the spell duration increases to 24 hours.