Dancing Flame

The flame ignores the range restriction on its telepathy when communicating with a creature it has Charmed. The two don't even need to be on the same plane of existence.

The flame sheds bright light in a 20-foot radius and dim light for an additional 20 feet. If it leaves the hall or is reduced to 0 hit points, it is destroyed and can't re-form for 24 hours.

Melee Weapon Attack +5 to hit, reach 5 ft., one target. 6 (1d6 + 3) Fire damage.

One humanoid the flame can see within 30 feet of it must succeed on a DC 15 Wisdom saving throw or be magically Charmed for 1 day. The Charmed target obeys the flame's verbal or telepathic commands. If the target suffers any harm or receives a suicidal command, it can repeat the saving throw, ending the effect on a success. If the target successfully saves against the effect, or if the effect on it ends, the target is immune to this flame's Charm for the next 24 hours.
The flame can have only one target Charmed at a time. If it charms another, the effect on the previous target ends.

The flame kisses a creature Charmed by it or a willing creature. The target must make a DC 15 Constitution saving throw against this magic, taking 32 (5d10 + 5) Psychic damage on a failed save, or half as much damage on a successful one. The target's hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.