Hail there.
I was thinkin' 'bout 'what if there would be real connection between water elemental and alchemi, not only in the description" so here it is:
Icarus' potion: Give the target creature the dive ability. During the progress the creature's power wains, and it loses 30% of it's AP.
The AP loss is because it would be imba on a dragon, and the percent based loss is because -3 would be OK for a dragon, but would suck on a Dragonfly, or similar.
Hope it helped,
Joe 'MG' Gasgano