I actually keep silverfish as pets. I put them in a large fish tank for them to swim. They like to swim towards people that are close so its rather entertaining.
There is a way to have a working Giant. Spawn a Zombie(Or any other hostile mobs), go to chat, then use the command that can change the scale of the mob. Then boom! Working Giant
redstone monstrosity is in minecraft duengons! i have seen that in minecraft dungeons the illager i mean the tiny Pilliger was take over by an infinity stone and he used the redstone monstrositys to raid the villagers! and then there was a triler about us!!!!!!!