Outsider's Gate is the fifth stage in Stories of Legend sub-chapter 20, Silk Road.
During the Battle
The Enemy Base will spawn more enemies: 1 Squire Rel, 1 Master A. or 3 Owlbrows.
You will need heavy attackers, such as Bahamut, Ururun, and any uber rares to deal with the Owlbrows, it is highly recommended you use Jamiera Cat and Crazed Mythical Titan Cat to hurt the Master A.'s. However, the Master A.'s spawn continuously, so the Titans will be unable to hurt the Master A's meaning long range attackers, like Hacker Cat, are mandatory.
This level can easily be beaten by waiting for the Owlbrows, getting past the Master A., and killing them with something like King Dragon, Crazed Dragon and Crazed Wall. Then just spam (Crazed) Titans, Dragons, Crazed Whale, Hacker Cat, Crazed Gross and everything, that can damage the Master A.'s. The Owlbrows should keep your money up.
- Lineup: Meatshields (the author for this strategy used Crazed Cat, Crazed Tank, and Gato Amigo), Crazed Sexy Legs, Dragon Cat, Crazed Dragon, Jamiera, Crazed Titan, Hacker Cat, a ranged Uber of your choice (the author used Cosmo), or another helpful Cat.
Simply stall the enemies with your Titans, chip away at the Master A.'s health with Dragons, and use your other hitters to dispatch the Owlbrows.