You focus your powers of observation on the unholy implement of The Great Beheader:
Item 'the unholy implement of The Great Beheader' is type weapon, alignment 0, made of obsidian,
has keywords 'unholy implement great beheader bloody weapon piece', equipped wielded as a weapon.
This item weighs 0 stones and 61 pebbles, and is valued at 34,900 gp.
This level 246 item has the attributes: identified wont-fuse magic-resistant
The unholy implement of The Great Beheader looks well used.
This item has a default lifespan of 90 days and will expire on Tue Jan 15 01:55:33 2008.
Weapon type is axe, does 217 points of slash damage for 2 stamina, accuracy 11.
With your knowledge of 'axe', this weapon can cause 345 damage against 0 ar.
Special weapon attributes: sharp
Affects accuracy by 1.
*This item may be repaired 4 times and renewed 4 times.
+++ the unholy implement of The Great Beheader has, when fighting a PC
whose hp is less than 10%, a random chance to stalk towards them, and 24
seconds later to decapitate them, at a cost of 250 st, at a rate of 7%.

--This item randomly causes you to stalk forward toward your opponent. At that point you have 24 seconds
(seems to game seconds, so 2 rounds) to get them within 10% of their max HP, and then you have a 7% chance to
decapitate them.