Nice to meet Vazkii.
My name is Hibiki.

The Narslimmus are not doing their job, the Slimes go over their range of action but do not absorb them.

working for me

your slimes need to be natural-spawned slimes, in a slime chunk. They can't be slimes spawned by a bigger slime after it dies.

It's a natural-spawned slime in a slime chunk ;-;

do you have a mod list? is this the latest version of botania?

Narslimmus work in Garden Of Glass, but not on a normal or super-flat map

can you make it happen with botania alone?

lack of update