Cinderstep

When you move, you can cause the ground beneath you to scorch and crumble into hot ash, leaving a 5-foot-wide trail up to 10 feet long along your path.
• A creature that enters this area or starts its turn there must succeed on a Dexterity saving throw (DC 15) or take 1d6 fire damage and have its movement speed reduced by 10 feet until the start of its next turn.
• The ash remains until the end of your next turn.