At some point, Leonardo was sent to the Shield for an unknown crime and joined the Hel-Rangers. Leonardo spent most of his time creating technology for the rest of the Hel-Rangers to use against the hordes that attacked the Shield.
During the final days before the wall fell, Leonardo developed an Enlightment Cannon which drew upon the power of Michelangelo. Utilizing the cannon to reveal the truth to The Thing used up the rest Michelangelo and, after loosing the man he loved while discovering the truth of life, Leonardo killed himself.
When combined with Michelangelo formed the Vetruvian Man, the full extent of the Vetruvian Man's abilities are unknown.