Imp Champion Scroll, or the red strange glowing orb
Imp Champ Scroll I have 1 in troll, 1 I fed to troll before resetting name on accident, 1 I left on floor because I didn't want it, 1 I used for the Champion's challenge, and then I have another 4 in my bank. That's a total of 7 Imp champion scrolls.
I originally started getting scrolls while going for Slayer of Imp's title, and then got a few extra for fun.
Red strange glowing orb I like because it's a neat little easter egg to get it, and I love the way it looks like a red orb of armadyl.