I've done some more work on the particle engine. It's now fully customize-able in XML and you can easily hook it up to events. For example an AI has these events available for hook-up:

- on_spawn
- on_step
- on_block
- on_damage
- on_crit
- on_death

Here are some pictures of the XML for those interested. Otherwise just scroll down to the video for a demo, i think it looks really good! :)

XML asset

Scripted on a mob

Youtube Demo!