Mending

Acquisition
Skill quests Skill trainers Hero skill trainers
 * Prophecies
 * Helping the People of Ascalon (Old Ascalon)
 * Prophecies
 * Captain Osric (Yak's Bend)
 * Dakk (Ember Light Camp)
 * Factions
 * Michiko (Kaineng Center)
 * Akane (Senji's Corner)
 * Nightfall
 * Medando (Yohlon Haven)
 * Nightfall
 * Pikin (Kamadan, Jewel of Istan)

Trivia

 * A famous joke is to use the skill Echo before using this skill, you'll have two Mendings on your bar and will be invincible.
 * One of the main skills in typical "Wammo" skill bar, subject of many jokes in Guild Wars.