Heretic's Brand

You brand an enemy you can see with a mark of divine judgment. For two rounds, every hit the target receives from any source adds one stack to the Brand (maximum 10 stacks). Hits that land after maximum stacks deal an additional 5 Divine damage each. At any point during your third round, you may release the Brand as a Bonus Action. The target takes 10 Divine damage per stack accumulated. The Brand is visible as a glowing sigil on the target.