Once Erich and the others had regrouped at the cave, Mirage began building a fire, while Mala went out to hunt. They had little field rations with them, and would need food and fresh water to sustain their captive.
As species that were genetically engineered for the purpose of combat, Erich and his comrades would not need to eat, drink, or sleep for an extended period of time before it began to negatively affect their health.
But the Elves had rarely experimented with their own genome. It was considered taboo by many societies for a plethora of reasons to embrace the ideas of genetic augmentation and eugenics. Thus, an elven sage still required regular nourishment to survive.