Little suggestion regarding PotionEffects.

There are lots of getters for this class (getType, getDuration, getAmplifier, getColor, hasParticles and isAmbient). Although (and that's quite annoying), there aren't any setters; Here's a list of useful setters (actually they're only the reverse of the getters, so they're self-explanatory) :

• setType(PotionEffectType type)
• setDuration(int ticks)
• setAmplifier(int amplifier)
• setParticles(boolean hasParticles)
• setAmbient(boolean isAmbient)
• setColor(Color color)