How does the Bloodletting Focus domain feature…

How does the Bloodletting Focus domain feature interact with spells like Hunter’s Mark?

how does the Bloodletting Focus domain feature interact with spells that don’t explicitly deal damage but increase the damage you deal (e.g., Hunter’s Mark)?It only effects spells that directly do damage, so no effect on hunter’s mark and their ilk — Matthew Mercer (@matthewmercer) March 25, 2018