Day 5: The Yellow Hat (from Pink) doesn't actually multiply the spells by 1.2, rather it changes their scaling. For Susie's heal, it just boosts the magic scaling, not the scaling based on how many times you've cast it.
For Ralsei's heal, it does multiply the magic scaling by 1.2, both for ReviveSong and Heal Prayer.
But for Rude Buster, it just increases the attack scaling from 11 -> 12 and the magic scaling from 5 -> 5.5. This isn't even a 10% increase in damage! Therefore if you want to utilize the full benefits of the yellow hat, equip it to Ralsei!













