The Fortress of Solitude: The Chasm is the area of the Atlantic surrounding the Fortress of Solitude.
With the access teleporters in flux and the air around the fortress filled with Brainiac ships, the combined forces of the Justice League of America and the Secret Society of Super-Villains are forced to approach the fortress' outer limits via the Atlantic underground chasms.
- Brainiac's Forces have blockaded Superman's Fortress of Solitude. According to Superman, the Fortress holds kryptonian technologies so dangerously advanced that they are banned from being used on Krypton. Superman and Lex Luthor must unite to stop Brainiac from obtaining them.
Talk to Superman, then follow him. Try not to stray from the path or you might be hit by the orbital bombardment of the Brainiac ships, which usually hits 1500 to 2000. Superman would use Heat Vision to blast open an underground tunnel to the Fortress.
The first boss is the Brainiac Herald. He summons hordes of dwarf mites and various sun crawlers, and it seems to have a special attack that deals 2000+ damage in melee range, but is fairly manageable.
The second boss is the Sunstone Broodmother, which is quite possibly the hardest fight of this raid. The Broodmother is surrounded by a shield that prevents all damage; players must kill the slow-moving sunstone retrievers. They will drop a sunstone that must be transported to the Broodmother. After a number of sunstones are used on it, the shield vanishes. However, if a sunstone retriever reach the Broodmother and back to the edge of the battlefield, it will summon a damaging sunstone sentry in its place. Also, the players will come under heavy fire from sunstone turrets and Brainiac Sun Guardians, the latter of which is programmed to target healers, so watch out.
The third boss is the Scorpionod MK-1, which is a relatively straightforward fight, other than that it often grabs a single player with its tail and throwing them dealing heavy damage, occasionally burrows underground and bringing down many sunstones, each of which would spawn a burrower if not picked up and smashed.
The final boss is ironically the easiest of all. Controlled by Brainiac, Krypto attacks the players alongside the Sunstone Domineer. While the player could destroy the pillars to free Krypto, it is not recommended as the Sunstone Domineer is easy to defeat and doesn't have any tricks.