From SmashWiki, the Super Smash Bros. wiki
Hitbox visualization of Ike's uncharged Eruption.
Hitbox visualization of Ike's fully charged Eruption.
Ike's neutral special in SSB4 is Eruption. Ike charges up Ragnell that is alit with flames before thrusting it into the ground, creating a pillar of blue fire. It is Ike's main edge-guarding tool and has many positives. The longer Ike charges the taller and stronger the flames will be, having incredibly high vertical range at full charge, putting opponents at tough spot and can KO as low as 45%, the uncharged tip can meteor smash, uncharged has a longer downward reach until the move is fully charged, it has transcendent priority and when fully charged it has four frames of super armor starting on frame 234 and ends on 238. However, when it fully charged, Ike will receives 10% recoil damage. In 1.1.4 Eruption's hitbox duration now lasts 2 more frames.
- Eruption's hitbox lasts 2 frames longer.