So here’s my thinking.
It’s going to be 6-12 months before the team has time to make truly new creatures and implement them. More likely on the 12 month side.
Palette shifting is when you simply recolor a creature and use the existing 3d models and animations.
So my suggestion would be to add a bunch of palette shift/palette swap mobs with new abilities but using existing creature models. Some examples:
Black cuttletrunk: Shoots a projectile that warps you to a random block within 20-50m
Mud spitter: shoots a stream of mud that slows you and prevents grappling or jumping for 2 seconds. Could use the beam effect from Cuttletrunks just recolor the beam.
Acid hopper: instead of exploding, it releases a poison gas cloud, and doesn’t die from doing this.
Sticky wildstock: when it head butts you, you get stuck on its horns for 3 seconds
Lightning wildstock (blink?): when it reads up it casts AoE lightning in front of it
Slow roadrunner: roadrunner that doesn’t flee and walks very slowly. But if it touches you, you get one shot. Maybe make it sparkly like Mario after picking up an invincibility Star.
Poison wraith: when hit by a poison wraith you get poisoned and can only dispel the effect by killing the wraith that poisoned you.
Also, treasure goblins in diablo are super fun. Maybe introduce some treasure roadrunners in hunts that, if you kill them before they escape, they drop 10x loot or something.
I’m aware we already have rift and umbris and blink etc versions of the creatures. Could definitely use these models just give them unique abilities.