Sage Mode

First, Jiraiya will wipe additional lines on his cheeks and summons the two Toad Elders which takes a bit of time.

When the toad elders arrive Jiraiya's appearance is altered (he has a bigger nose, a goatee and his eyes are like toad) in this form Jiraiya’s strength and speed is increased. When Jiraiya transforms to Full Sage mode he crouches and his body takes on even more toad like appearance, his hands and feet becomes like a toad also the lines on his face become much thicker taking each side of his face.

This was used in Jiraiya's battle with his former student, Pein.