Polymock: Defeat Grulhammer Silverfist

Overview
Summary
 * Defeat Grulhammer Silverfist in a game of Polymock at Umbral Grotto.

Obtained from
 * Hoff in Rata Sum

Reward
 * 250 Asura Reputation points
 * Summon Ruby Djinn
 * Fire Elemental Polymock Piece

Requirements
 * Polymock: Defeat Fonk

Followup
 * Polymock: Defeat Necromancer Volumandus