Vitality Gels are pulsating cyan cubes that are occasionally dropped by enemies. When picked up, it restores a player's health vial. These cubes also appeared scattered about the lands. While sprites , the gel is the main healing method for players who are injured by the various enemies in the game.
By ascending rungs on the echeladder, players raise their 'Gel Viscosity'. This stat appears to make it more difficult for enemies to knock the gel out of the Health Vial that contains it, hence the name. It's analogous to a defense or stamina stat.