Flail

Acquisition
Skill trainers
 * Nightfall
 * Dau (The Mouth of Torment)

Hero skill trainers
 * Nightfall
 * Hoju (Gate of Torment)

Signet of Capture
 * Nightfall
 * Onwan, Lord of the Ntouka (Arkjok Ward)
 * Churrta the Rock (Jahai Bluffs)
 * Eye of the North
 * Molotov Rocktail (Dalada Uplands)
 * Jormungand (Drakkar Lake)
 * Shons the Pretender (Sacnoth Valley)

Trivia

 * The warrior in the skill icon wears Sunspear Armor.
 * A similar looking warrior also appears on the skill icons of Headbutt, Enraging Charge and Lion's Comfort.