The skull sceptre is a non-rechargable item. Much like the games necklace or ring of duelling, once all charges have been depleted the staff crumbles to dust and you need to get a new one.
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To get a Sceptre you must kill monsters in the Security Stronghold. The pieces of the skull sceptre are Left skull half, Top of sceptre, Bottom of sceptre, and Right skull half. Ankous, Catablepons, Flesh crawlers, and Minotaurs drop the pieces. Combine the Top and Bottom together, Combine the left and right, than combine the two pieces.
Any catablepon drops it doesn't matter what lvl
the ones right by the room treasure room if you need a hint?
You can recharge your Amulet of Glory in the Heroes' Guild, but the problem is you need to complete the quest "Heroes' Guild" otherwise you can't get to the fountain of glory to recharge it.
The Left Skull Half is dropped by Ankous on the fourth level of the Stronghold of Security.