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.
Here are a few more things to consider: 1  In slime chunks, slimes only spawn on layer 39 and below (feet pos). The spawn rate is equal on those layers. 2  Mobs can't spawn closer than 24m to you (but despawn when farther away than 128m), so don't stand too close to where you expect them to spawn.