It's a part of the skull sceptre (Literally spelled that way).
If you collect all the pieces received from various monster drops in the Security Stronghold, the sceptre can teleport you to Barbarian Village up to 5 times.
The Left Skull Half is dropped by Ankous on the fourth level of the Stronghold of Security.
the goblins on the first floor drop it.
minotours for right skull half,
It is a random drop, it could be any number.
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).
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The entrance to the dungeon is located in the center of Barbarian Village, near the mine. On Floor 1 you need to kill Minotaurs to get the Right Skull Half. On Floor 2 you need to kill Flesh Crawlers to get the Bottom of Sceptre. On Floor 3 you need to kill Catablepons to get the Top of Sceptre. On Floor 4 you need to kill Ankous to get the Left Skull Half. Use the two skull halves together to get a Strange Skull. Use the two sceptre pieces together to get a Ruined Sceptre. Use the Strange Skull with the Ruined Sceptre to get a Skull Sceptre.
you can teleport to barbarian villiage.
dropped by ankous in the security of stronghold
Draynor Village, Wizard's Tower.
In the current version of Runescape, RS2, you cannot. If you have a Runescape Classic account, you can be half male-half female
Use them on eachother, as part of a sceptre.