Dark side ritual

"Kintik hadzuska sutta chwituskak! Kintik hadzuska sutta chwituskak! Jiaasjen Jidai, jiassjen Jidai!"

- Darth Sidious invokes the ritual

A dark side ritual was an art of Sith magic that allowed a Force user to see things one could otherwise could not see. It required a connection between two others and a drop of blood from one of the two. The ritual was started by chanting a certain phrase and fed by Force lightning.

When Jedi Master Yoda went to Moraband, Darth Sidious sensed this, and summoned his apprentice Darth Tyrannus in order to attack Yoda with the ritual.