"Kali, Hera, Cronus, Tonic. Air like nectar as thick as onyx. Cassiel by your second star, hold mine victim as in tar." - Willow Rosenberg.
This spell was a powerful incantation that invoked a number of gods and spirits. It was meant to contain someone turning the air around them as thick as tar. This spell was used by Willow in a battle against Glory. Apparently it was strong enough to even hold the hell-goddess.