The Second Dimension is the setting of Skylanders: Battlecast, in which conventional forms of battle aren't applied. With many Elemental Realms and a new section of the Skylanders Academy, it was taken over by Kaos' forces after a rift was opened into it, and the player must become a Battlecaster to lead the Skylanders to free it.
Though in earlier versions of the game, its skies were endless clouds like in Skylands. In its recent update, it is a mystical night sky divided by constellations spanning its entire length, some containing smaller ones in the shape of the Elemental Symbols.
Battles cannot take place the same way as in Skylands. Every action must be coordinated by the team leader or the Battlecaster, casting spells according to their current energy crystal reserves, and only spells in cards they have in hand with the right conditions. Direct attacks or team rearrangement can be done once every turn, but only once for each unless spells that alter these mechanics have been used.
Oddly, even actions such as eating must be coordinated if the parties are in battle, as seen with Hearty Meal and other cards.
- Fire Realm
- Water Realm
- Undead Realm
- Life Realm
- Tech Realm
- Magic Realm
- Air Realm
- Earth Realm
- Kaos Realm
- The Elemental Realms have similar naming as the Light and Dark Realms, though it is unclear if they are part of the Second Dimension or part of Skylands.
- Each of the Realms has a specific Element, and in early versions of the game they need a corresponding Skylander to be opened. This is similar to the Elemental Islands and Sanctuaries in Skylanders: Lost Islands.
- Kaos attempted to rename it the "Second Doom-ension".
- Despite most of the realms containing a Doom Raider of its element, in the Water Realm, the final mission has Chill Bill instead of The Gulper, who doesn't appear in this game. Kaos, sometimes refered to as the Magic Doom Raider, has his own area, and in the Magic Realm, two other Magic villains are used instead.