Crush

Crush (クラッシュ, Crush) is a Mars Utility Psynergy introduced in Golden Sun: Dark Dawn. It is available upon defeating Sludge and acquiring the Crush Tusk. It can also be used in battle as an offensive Psynergy. Its encyclopedia entry reads as follows:
 * "This fire-based Psynergy strikes an object with great force. It can be used on cracked boulders and weakened floors to shatter them."

Basic Description
Crush is an offensive, single-target Psynergy. The final damage inflicted by Crush is determined by comparing the user's Mars Power to the target's Mars Resistance, then multiplying this factor by the base power of the move.

Crush's in-battle appearance is visualized as a pair of large, blue, interlocked hands that form above the target and strike the opponent.

Crush as a Utility Psynergy
Crush's main use is as an important Utility Psynergy in Dark Dawn. In practice, Crush can be considered a hybrid of the Pound and Burst Psynergies found in Golden Sun: The Lost Age. Like Burst, Crush allows the player to destroy large, cracked rocks. Crush can also push down pillar like-objects into the ground, akin to Pound. Also, when Crush when standing on seesaw-like levers, using Crush on the opposite side will catapult the player into the air, making it possible to reach platforms that are otherwise too far or too high to jump on.

Availability
Like many Utility Psynergies, Crush is only available by equipping an object imbued with the Psynergy, namely the Crush Tusk, which is obtained after defeating the monster Sludge in battle. The ability to equip the Crush Tusk is limited to Mars Adepts, meaning only Tyrell and Eoleo can equip it. Once the Crush Tusk is equipped, Tyrell and Eoleo will retain Crush no matter what class they are currently in.

Analysis
General: While Crush has offensive capabilities, they are often overlooked. Crush's power is generally equivalent to mid-game Psynergies like Flare Storm. However, since Crush is Power-based, it quickly loses power against stronger opponents, and will generally see little, if any, late-game usage.

Golden Sun: Dark Dawn: Tyrell will generally be the recipient of the Crush Tusk. However, when it is received, Crush's power will already be weaker than his other Psynergies, namely Flare Storm, Eruption, and Heat Wave/Liquefier. Thus, Crush is likely to see little use. In particular, Crush is already inferior in power to the Arid Blast and Arid Scorch, which Tyrell has had for a significant portion of the game.

Psynergy cast by enemies
Crush is part of the arsenal of Sludge, who demonstrates its offensive and utility functions. It is stated that the Crush Tusk contains the power Sludge used.