You enter the ominous cave where you are sure the caster of Edo Tensei jutsu is located. There you find him. Kabuto is draped in a red robe.

Hmhmhmhm! So you've come. Excellent. I can give this new body of mine the proper workout it deserves.

Kabuto throws off his robe to reveal his pale gray, scaly, and horned body. A large serpent protrudes from his stomach, hissing at you. Kabuto has perfected snake sage mode.