Bufferspell

You assist a creature in the process of casting a spell. You can add one of the following effects to the spell:

• If the spell is a damage spell, you can add additional 1d6 Force damage.
• If the spell requires a saving throw, you can increase DC by 1.
• If the spell is a healing spell, you can add additional 1d4 to the healing. 
• If the spell increases AC of a target, you can add additional 1 AC to the effect.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, you can increase the same effect by same value, once per slot level above 4th. You cannot choose multiple effects at once; e.g using 7th level slot, you can add 4d6 Force damage, but not 3d6 Force damage and 1 DC increase.