Bukkit

Every aspect of MobEffects can be configured. You can configure whether you want certain effects enabled for certain mobs, or you can configure the time the effect lasts / the power of the effect.

A full commented version of the config (v1.2.0) can be found here: http://pastie.org/4918469

Each mob has quite a bit of potion effects underneath it, each one should be pretty self explanatory. I will explain each of the attributes in the config.

Worlds : Here you can list the worlds that the effects are active in.The default 3 worlds are already in there for you. You may change these as you wish.

Enabled : Whether or not the potion effect is enabled. You can change this to true or false as you wish. This is per potion effect per mob. Meaning that you could have speed on for Zombies, and off for Slimes. Or you can have speed on for zombies, and everything else off. ALL effects default to false.

Time : How long the effect will last. This is in ticks. There are 20 ticks per second. Ticks will default to 500 unless you specify otherwise. 500 Ticks = 25 seconds.

Power : This is how strong the effect is. This will default to 0. 0 = Potion Level 1. For example, Speed Power: 0 = Speed Potion 1. This can be anywhere from 0 - 2. 2 being the strongest power.

DodgeChance : Percent chance of a player dodging the potion's effect. This can be any decimal between 0 and 100. It MUST be a decimal. This could be anywhere from 0.0 to 100.0. Example: 12.34.