I’m reading the latest Forgotten Realms novel, and I have an idea from a spell I saw.
Casting Time: 1 action or 1 reaction
Range: 50 feet
Components: V, S
Duration: 1 hour
You create sticky goo that seals a target within. This spell can be used in two different ways. If used against an unwilling target as an action, the targeted creature must make a Dexterity saving throw. On a failure, the creature is restrained. A creature can attempt to escape the goo with a Strength saving throw as a move or an action. If used against a willing target as a reaction in response to the creature being damage, the target gains 1d6 temporary hit points as you seal the target’s wounds with the spell. Only the wound on the creature is targeted, so the willing target is not restrained. In either case if the spell duration ends, the target is freed from the goo. The goo has 10 hit points and is resistant to bludgeoning and piercing damage, but vulnerable to fire damage. If the goo is removed from the willing target and the target still has temporary hit points, all temporary hit points are lost.
At Higher Levels. For each spell slot cast higher than 1st, increase the hit points of the goo by 4 and the amount of temporary hit points granted by 1d6.