Tier 8 pet struggling in this battle challenge, so I thought I'd check the Ultimate Weapon Guide...
Look at that Extremely Emo Spork does 270 icons, you lose 99%hp though, no problem, got myself a Phoenix Quill to pair it up.
Yeay, let's see what this does. Bam, instant death to the enemy. How nice is this item, so glad I bought it, let's fight again! :D
Wait, erm, where's my Spork?
One use only... -48 million SP, biggest fail ever :(
Ouch... I feel with you. What enemy were you fighting? D:
Lady of the West Wind of all enemies... Was struggling with her because of the no healing on her :/ At least I got to beat her once now, lol
Ouch. :c Well at least it is a mistake you'll only make once? D:
True that... I completely overlooked the "One use" it said in the guide. Or my mind didn't want to read it as such. I thought it was a really nice bomb, once per battle lol :D
Yeah. A once per battle would have been okay but then I guess they would have to tone down how strong it is or you'd get almost insta kills on a lot of enemies. XP Good luck with the Lady next time. :c
coughs I might just change One Use text to red or something tonight. I don't have many of those in the guide or in the pet tier lists, but I did mention a few that did a note-worthy amount of damage or healing. They're pretty easy to overlook, though, I suppose.
I remember back, that item used to be breakable, you could get a few uses out of it. That's how I got my MCAB and P-staff, before Maleria was retired and Prodigy was turned into the monster he is now.

Also interesting bit of information, on a no heal challenger all kinds of healing is disabled, including negative heals. Which means -100% heal actually takes nothing away from you. Which is pretty cool, I think. :P