The Demon Tide is a Pureblood Heartless that appears in Kingdom Hearts 0.2 Birth by Sleep -A fragmentary passage-. It is a more powerful version of the Demon Tower that ambushes Aqua and King Mickey in the remains of Destiny Islands.
The Demon Tide attacks Aqua and King Mickey when they arrive at the remains of Destiny Islands and investigate the door inside the Secret Place. It is defeated by the two Keyblade Masters, but returns to hunt Riku shortly after they find the Kingdom Key D behind the door. Aqua and King Mickey rush to Riku's aid, and Aqua attempts to restrain the Demon Tide with chains of light. The Heartless breaks free, and it drags Aqua back to the remains of Destiny Islands, destroying Mickey's shirt in the process. As Mickey helps Sora and Riku seal the Door to Darkness, Aqua battles the Demon Tide and promises to help anyone else who falls into the Realm of Darkness.
Much like the Demon Tower, the Demon Tide is a swarm of Shadows. It is large, travels in waves, and has a core that glows violet or orange. The Demon Tide has two forms. The first is a large wave of Shadows. When it takes enough damage, it plunges this wave into the ground. This turns the entire area in shades of red and black. When it re-emerges, it takes the form of a tornado of Shadows with an orange core at its center.
When the Demon Tide takes damage, individual Shadows will fall out of the swarm and disappear. Many of its attacks also comprise of launching individual Shadows, which disappear after impact.
The Demon Tide is the final boss of Kingdom Hearts 0.2 Birth by Sleep -A fragmentary passage-. As such, it is resilient. Aqua should be sure to have many items equipped before she faces this Heartless.
This boss initially has access to three attacks: a soaring strike, a Shadow trap, and an assault from underground. Each of these can be avoided with a well-timed Barrier, and a quick Counter Blast can then be used to damage the boss. Aqua can tell when the Demon Tide is about to attack by watching the eyes of the Shadows that comprise it: when the eyes glow red, it means the boss is about to strike. Aqua should avoid the Demon Tide in these instances and use a combination of physical attacks and magic to harm it in the interim. Whenever the Wayfinder Situation Command becomes available, Aqua can use it to immobilize the Demon Tide and quickly deplete its HP by teaming up with King Mickey.
The Demon Tide becomes much more aggressive in an attempt to protect its vulnerable core. Added to its arsenal is a new projectile attack that is best avoided with Cartwheel. It switches between this and a another attack, in which its tornado of Shadows glows red and rushes Aqua. During this attack it retreats every now and then, giving Aqua the ability to use Barrier again. If Aqua stands too close to the edge of the map, it might not retreat far enough. In this case the attack is continuous. When its health gets even lower, the Demon Tide warps away its core whilst its tornado remains. After this, invulnerable orbs made of Shadows will be launched from the ground at random. If this happens, Aqua should Cartwheel around as much as possible to dodge these. If she is hit, the orbs will launch her into the sky, where she is a risk of being hit again by other orbs. These can be avoided with Air Slide, although this becomes more difficult as Aqua falls towards the ground. At the end of the attack, the tornado increases in size and whirls around the entire arena, limiting Aqua's movements. When the Demon Tide is not using any of these attacks, Aqua should enter the tornado and bombard the Demon Tide with aerial combos until its HP is fully depleted.
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