Parallel drainage pattern. A parallel drainage system is a pattern of rivers caused by steep slopes with some relief. Because of the steep slopes, the streams are swift and straight, with very few tributaries, and all flow in the same direction.
1 In Creative, the player can use spawn eggs to spawn most mobs. 2  When mobs are spawned this way, all normal spawning requirements, such as light level and block type, are ignored. 3  Any entity can be spawned using the /summon command.
Our TShock server ends up being about 50+ people with an admin furiously spawning hundreds of mobs, so this fits in nicely. Feedback wise I would say it would be cool to have some kind of in-game panel to spawn these from, with the ability to customize waves of mobs that spawn.