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How to Kill the Boss in Dual Crush

Dual Crushes are powerful attacks found in "Castlevania: Harmony of Despair." Each Dual Crush attack requires two players to work in perfect synergy, using the powers of one to enhance the abilities of another. If you are truly skilled with Dual Crushes, you can earn the achievement "Grim Synergy," which is granted when you and a friend utilize a Dual Crush move to serve the final blow to any one of the game's bosses. It does not matter which Dual Crush you perform, nor does it matter which boss is slain, though the first boss makes the easiest target.

Instructions

- 1
  Play through "Castlevania: Harmony of Despair" with a friend. Kill monsters, loot items and progress through the game's early levels until you encounter the first boss, Gergoth.
- 2
  Fight Gergoth until he is extremely weak. Once he has reached around 10% of his normal health, you and your friend should begin executing Dual Crush attacks.
- 3
  Stand next to your friend and press the right-trigger button to initiate a Dual Crush.
- 4
  Ask your friend to hit the right trigger just as you initiate the attack. Your friend must confirm the attack to execute a Dual Crush.
- 5
  Repeat this process until the boss has been slain by a Dual Crush and you will earn the "Grim Synergy" achievement.

Xbox 360