This probably looks stupid right now, but this was meant to be compared with Fresh animations. (link below) Fresh animation adds a ton of new animations to the game including awesome ones for the zombie. run this command: /effect give @e[​type=zombie] speed 1000000 7 true (The 7 can be replaced with your specified speed), turn off hostile mob noises, and install fresh animations for ghosts to be roaming your world. You could also give them a strength effect too (Just replaced the speed with strength)



Fresh Animations link: www.planetminecraft.com/texture-pack/fresh-animations-v1-0/