I am doing research on the Burmese Weikza traditions and wanted help as to the usage of the skull in their magical practices.
What ever magical practice that might be, it has nothing to do with the Buddha, Dhamma an the Sangha and is called "Animal Art" by the Buddha and a grave misconduct.
So maybe the question is better placed outside of "Buddhism"
Skulls an bones are used as object of investigation and meditation, asuba-nimitta (object of unattractiveness), to gain high concentration if done right. Of coures such training in what is called Jhana, can lead to supranatural powers but such is not the aim just side effects of practicing.
(Note: This is a gift of Dhamma and not meant for commercial purposes or other worldly gains.)