Ember shot

An arrow of obsidian in your hand swirls with ash and flame. Make a ranged spell attack with it against one creature in range. On a hit, the target suffers the normal effects of the weapon and takes an additional 1d8 points of fire damage, causing the arrow to shatter and embed into the target. The heated shards of glass stay within the target, causing them to take additional fire damage equal to your spellcasting modifier at the start of each of their turns for 1 minute or until they spend a bonus action to pull them out.

At Higher level. When you cast this with a 2nd level slot or higher, the spell increases by 1d8 fire damage for each level of slot above 1st.