Soulus Mod 1.12.2 (Custom Spawning System)

The mod adds a bunch of objects to Minecraft, which is made for only one thing – to build a cool custom spawner. Initially, the spawner will be “weak” – spawn one mob every 10 minutes in a radius of 3 blocks. But all this can be changed – spawn up to 1 time in 10 seconds, the distance can be increased to 64 blocks and the number of mobs that spawn at a time, from 1 to 64.

There are a lot of crafting recipes, to complete the picture I would advise you to check everything again in JEI. The result is an interesting spawner that is interesting to customize.