MonsterManager
Randomize monsters, make more spawn, set spawning times,or modify dungeon scale. Check this out if you want something to handle how monsters spawn.By default this mod applies an algorithm to randomly spawn an amount of monsters based on the power level of the moon your are landing on. An attempt to make moons feel more alive but still allow the vanilla difficulty system to determine just how difficult it is. The higher the power of a moon, the more monsters will spawn, the mod prioritizes monsters typical to the moon but draws from all monsters both modded and vanilla to spawn on the moon.
If you do not like the algorithm, you may set your own strict amount of monsters to spawn and how much time should be between their spawns, or you may slightly tweak the algorithm (adding more or less monsters then it calculates, artificially lowering or raising overall moon power levels to make it how you like, or creating overall offsets on how much time there is before another monster spawns).
If you don't like randomization of all monsters, you may disable it to use the other features, or you can specifically choose what monsters you want to see being randomized.
The mod also lets you choose when to start spawning monsters, both for the inside and for the outside.
You may also adjust the dungeon scale by use of a multiplier, this defaults on 1x but can be scaled as much as you like (be carful it lags bad after 3x). Additionally you may choose which dungeons get this multiplier and can make it so monsters spawn further or close together from the main entrance.
Monsters are set up by "Hard" and "Easy" ratings, what defines what is hard or easy is their vanilla "powerlevel" its not 100% accurate to how dangerous a monster is but its the best you can get. This can be edited to change what defines easy or hard, or you can just set all monsters to easy and force the mod to only pull easy monsters if you don't like this system.