Cassian's Poison Needle

You launch a small poisonous needle from your hand produced via magical means. Make a ranged spell attack against the target. On a hit, the target takes 1d4 poison damage, and 2 poison damage on each turn thereafter for the duration. An afflicted target can use a bonus action to pull the needle out, ending the spell prematurely.  

When casting this spell in stealth, you can consume a spell slot to roll with advantage on stealth checks relating to not being seen when casting this spell. Consuming a spell slot in this way also causes the needle to sink deeper into the skin of the opponent. They must use an action to pull the needle out instead of a bonus action.

This spell's damage increases by 1d4 and the after affect increases by 1 when you reach 5th level (2d4) + 3, 11th level (3d4) +4, and 17th level (4d4)+ 5.