Aqua Shell

A protective sphere of swirling water surrounds the target. For the duration, it gains 5 temporary hit points at the start of each of its turns. While it has any amount of these temporary hit points, weapon attack rolls against it have disadvantage & has resistance against fire damage.

Using Higher Level Spell Slots. The spell lasts up to 10 minutes & provides 10 temporary hit points at the start of each of the target's turns, if cast with spell slots that are level 5 or higher.