Detect Blood

For the duration, you sense the location of any Beast, Dragon, Giant, Humanoid or Monstrosity within 30 feet of yourself. Similarly, you know if a creature in range is wounded or Bloodied, and you detect and locate objects soiled with blood such as a weapon that just damaged a creature or a blood trail on the floor.

The spell is blocked by 1 foot of stone, dirt, or wood; 1 inch of metal; or a thin sheet of lead.

Using a Higher-Level Spell Slot. The range of the spell increases by 30 feet for each slot level above 1.