A healer is someone who was born with a gift to heal someone however Healer's 'gift' is actually not that great, most of them can only heal small wounds like graze from sharp objects, or stop someone bleeding though it depends on whether the bleeding is big or not they also reduce fatigue or pain and mild poison some healer who got better ability can do slightly better like healing stab wounds or cure mid- level poison but still compared to Lory's healing gift that can cure anything and hundreds of people at once prove the disparity between them was significantly huge almost like jokes but still they are quite useful especially when potions and common medicines were scarce.
However, a lot of healers gather at the S.A.I.N.T organization because the organization gives a lot of benefits to healers like free tuition, free-living place, health insurance and even free tax for the entire family therefore many people who got healing abilities drawn by the organization.