"origin" - appears at the unit's feet
"chest" - appears on the unit's chest
"hand, left" - appears on the left hand
"hand, right" - appears on the right hand
"foot, left" - appears on the left foot
"foot, right" - appears on the right foot
"weapon" - appears on the weapon (this is whatever the unit attacks with, so if the unit attacks with its mouth, that's where the effect will show up)