jgsugden
Legend
Correct on both counts, and intentional on both accounts.That's flavorful but:
1. Not as bad as original witchboolt, but the target just has to dash to get out of range, assuming it cares about 1d8 damage, which isn't a lot for an action.
2. Sure you're causing advantage against the target (good) , but you, a spellcaster, have also put a literal glowing target on yourself which enemies have advantage to hit (extra super bad) !?!
This spell primarily encourages them to flee out of your range/line of sight to stop the advantage. The extra damage on subsequent turns is a side note, primarily a legacy addition. The advantage is the benefit - and it comes with a cost, intentionally. You're putting a target on your head in exchange for putting a target on the enemy. Given that you choose when and how to put the target on the enemy, you get to use it strategically.
It sees use, but it is not a no-brainer spell.