Earthquake

Acquisition
Skill Quests: Skill Trainers: Signet of Capture:
 * The Lost Princess (Fishermen's Haven)
 * Bartoch (Droknar's Forge)
 * Dakk (Ember Light Camp)
 * Nazeem the Damned (Gates of Kryta (Mission))
 * Gezna Shadowstalker (D'Alessio Seaboard (Mission))
 * Najja Doombringer (Divinity Coast (Mission) or Majesty's Rest)
 * Splinterquake (Sage Lands)
 * Thornwrath (Bloodstone Fen (Mission))
 * Bristlefire (Ettin's Back)
 * ... more to be added ...

Related Skills

 * Dragon's Stomp (Duplicate)
 * Lightning Surge (Elite)
 * Meteor
 * Meteor Shower
 * Mind Burn (Elite)
 * Mind Freeze (Elite)
 * Mind Shock (Elite)
 * Shock
 * Thunderclap (Elite)
 * Whirlwind