According to tipit's combat calculator...this character would own. The prayer retribution does up to 25% of a player's maximum prayer. So, a person with 80 prayer could hit 20 with retribution, etc. So...how about a person who pks solely with this prayer? Make his stats 1 att, 1 str, 1 def, 10 hp, 1 range, 1 magic, and 99 prayer? According to the combat calc, he would be combat level 15. Now, go to a guard in Varrock, allow yourself to be taken down to 2hp or so. Go into level 1 wilderness, find a group of level 14s-16s and have a friend standby. You could even wear some cheap bronze or iron armor to entice people to attack you. Now here's the beauty. With 1 def and 2-3hp left, you're a ticking time bomb. Chances are, the level 14s-16s don't even known what retribution does, and none of them are likely to think that you have 99 prayer and little hp. As soon as one even thinks about attacking you....BOOM! The character blows up right in your face like an Infested Terran...and you're sent back to Lumbridge. This character could hit 24s...to multiple targets! Or you could get creative...have a friend poison you, and go stand by some innocent bystanders in the wilderness. The possibilities are endless! Now of course, this is completely unpractical...as 99 prayer would cost billions and take a LOT of time. However, pretty neat thinking of it..