10th-level Chemist feature
During a long rest you may store a number of spells from your Chemist Spells feature into small vials and bottles. These bottles can be used by you or an ally as if they cast the spell but without requiring a spell slot or the spellcasting feature, they are cast at their base spell level. You can have a number of vials equal to your proficiency bonus, and each bottle must be a different spell.