I am making a character whose concept is that if you get within 5/10/15 feet of him, his aura hits you and you take damage. It only needs to work once per long rest though more is obviously better.
To that end, I am looking for spells, class/racial abilities, and magic items that create an aura that moves with the character, and ideally stack together.
I am using the WotC official rules only, not including Unearthed Arcana.
Note: the idea is to have AoE damage over time that moves with you. Single-use spells with no duration like fireball don't count.
Here is what I have so far; please help add and correct anything that does not work. My hope is to create a solid list to pick and choose from.
Starting at 3rd level, you can use your action to unleash the divine energy within yourself...... at the end of each of your turns, you and each creature within 10 feet of you take radiant damage equal to half your level (rounded up).
Ranger-Hunter Level 11
You can use your action to make a melee attack against any number of creatures within 5 feet of you, with a separate attack roll for each target.
Druid-Circle of Spores Level 2
Halo of Spores
When a creature you can see moves into a space within 10 feet of you or starts its turn there, you can use your reaction to deal 1d4 necrotic damage to that creature unless it succeeds on a Constitution saving throw against your spell save DC.
When you deal your Halo of Spores damage, roll the damage die a second time and add it to the total. Your melee weapon attacks deal an extra 1d6 necrotic damage to any target they hit. These benefits last for 10 minutes
You call forth spirits to protect you. They flit around you to a distance of 15 feet for the duration.....An affected creature's speed is halved in the area, and when the creature enters the area for the first time on a turn or starts its turn there, it must make a Wisdom saving throw. On a failed save, the creature takes 3d8 radiant damage (if you are good or neutral) or 3d8 necrotic damage (if you are evil). On a successful save, the creature takes half as much damage.