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Eruption is Ike's neutral special move in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS / Wii U. Ike holds his sword in the air before plunging it into the ground, creating an explosion that damages any nearby opponents. The move can be charged by holding the special move button, and automatically strikes once fully charged, though a fully charged Eruption deals 10% damage to Ike. In Super Smash Bros. Brawl, the flames the attack makes are red; the fire is changed to being blue in Super Smash Bros. for Nintendo 3DS / Wii U.
While the attack can be powerful when it's being charged, a full power Eruption actually delivers less knockback than some of the weaker stages of the charging process. In fact, the stage that comes before Eruption reaches full power can potentially make 1-hit KOs against most fighters.
On a side note, the full power Eruption delivers horizontal knockback, while all the other charging stages deliver vertical knockback. Additionally, Ike begins flashing red when Eruption is almost at full power.
In Super Smash Bros. for Nintendo 3DS / Wii U, this move has two custom variants:
Tempest cannot be charged as long and replaces the fire with wind that pushes opponents away; only the sword can deal damage, and a fully-charged Tempest does not damage Ike. When used in the air, the move does stall Ike's falling speed for a moment, which can help with his recovery.
Furious Eruption creates larger explosions that deal more damage to both opponents and Ike; the move can also damage Ike before it's fully charged.