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The Top of sceptre is a piece of the Skull sceptre that is dropped by catablepons on the third level of the Stronghold of Security. It is combined with the bottom of sceptre to get the runed sceptre. It has about a 4% chance of dropping and is considered the hardest part of the Skull sceptre to obtain.
the goblins on the first floor drop it.
you can teleport to barbarian villiage.
The Left Skull Half is dropped by Ankous on the fourth level of the Stronghold of Security.
dropped by ankous in the security of stronghold
Draynor Village, Wizard's Tower.
Use them on eachother, as part of a sceptre.
minotours for right skull half,
ankous or minotaurs i guess
The Bottom of Sceptre in runescape is combined with the Top of Sceptre to make a Runed Sceptre. This Runed Sceptre is then combined with the Strange Skull (made from a Right Skull Half and a Left Skull Half) to make a Skull Sceptre. This skull sceptre then allows the user to teleport to Barbarian Village (the location of the Stronghold of Security) 10 times (20 times if made while wearing Varrock Armour).
Your skull will go away after spending enough time away from a PVP area.