Ancient Blood Pendant

This pendant smells of iron and burning sage. When you use an action to squeeze the pendant, a small drop of blood drips from the pendant and onto an object of your choosing:

Roll a d4:

1 - human blood \ add 1d4 to one damage roll per turn until the end of the battle

2 - dragon blood \ add +2 to AC for 2 hours

3 - demon blood \ add 1d6 to one damage roll and one to hit modifier per turn

4 - celestial blood \ gain immunity to all damage for three combat turns (can still be restrained, grappled, stunned, charmed, etc.)

The blood can be wiped off, by a fiendish enemy, with an Intelligence DC equal to your spell save DC. 

Notes: Blood Mage