Comment 30 for bug 894934

A few things to add to this:

1: A tag for how long the effect lasts.
2: An animation tag for the affected units (Similar to EMP, iron curtain, etc
3: An animation tag for the unit that uses it (Something like the crate animations)
4: A tag that says whether or not the effect stacks or overrides similar effects.
5: Tags for minimum and maximum multiplier for stacked effects (so you can't debuff their speed until they're at 0)

All in all though, this'd be great to have.