You mean like bigger and stronger spiders or small faster ones? The normal spider is 2 blocks wide so maybe the small ones can skirt around your traps. Or maybe different colored ones?
Maybe you could have giant peaceful long necked dinosaurs that you can walk on. They don't attack you on any difficulty, but if they step on you by accident, then you will die instantly. Maybe if you manage to get on one, then you can build a small house on it. Also, when you damage them enough, like down to 64 Hearts, they will start whipping you with their tails and try to stomp on you.
18 Blocks Tall
80 Blocks Long
256 Hearts
For the carnivorous ones, when they bite you, you die instantly, but they only bite if you are close enough, and they can't see you if you are in the darkness. And they spawn on all difficulties, but on peaceful they will not attack you.
Maybe you could put a limit to how high the flying ones can go, like Layer 108 (layer 128 is the highest you can go). And like the long necked ones, they won't harm you on peaceful unless you hit them.
*EDIT* If you do put vines, you could make them climbable but really weak so when you climb on them a few times they break, and you don't get anything from mining it. (Like to to then they break)
0
0
0
0
0
0
2
18 Blocks Tall
80 Blocks Long
256 Hearts
For the carnivorous ones, when they bite you, you die instantly, but they only bite if you are close enough, and they can't see you if you are in the darkness. And they spawn on all difficulties, but on peaceful they will not attack you.
Maybe you could put a limit to how high the flying ones can go, like Layer 108 (layer 128 is the highest you can go). And like the long necked ones, they won't harm you on peaceful unless you hit them.
*EDIT* If you do put vines, you could make them climbable but really weak so when you climb on them a few times they break, and you don't get anything from mining it. (Like to to then they break)