Detect Aura

For the duration, you can visibly see the strength of any creature you can see within 60 feet of you. A creature's aura gives you crude information about its challenge rating and hit dice.

• The size of a creature's aura tells you its strength. A creature's aura can be Weak (CR 1/2 or lower), Average (CR 1-4), Medium (CR 5-10), Strong (CR 11-16), or Very Strong (CR 17 or higher). A creature's aura appears larger, brighter, and more vibrant the stronger its aura is.
• The color of a creature's aura tells you its toughness. A creature's aura can be White (3 or fewer hit dice), Yellow (4-9 hit dice), Orange (10-19 hit dice), Red (20-29 hit dice), or Purple (30 or more hit dice).
• You cannot use any ki points while using detect aura.