Turururururururururu!
Obtained by an Arrow, upon getting Doppio King Crimson, your health stays the same. (100 Health)
If you use a Frog on Doppio King Crimson, you get Doppio Two King Crimson, if you use another Frog on Doppio Two King Crimson, you get King Crimson. (1% Chance to Instead Get King Crimson Alternate Universe)