Contact Heshaphyx

In a ritual learned at a young age, you carve arcane sigils into a skull and place two gems within the eye sockets. After uttering a discordant word in an Elder language, the "eyes" of the skull flare to life and the dracolich Heshaphyx speaks through it. The spell lasts for 1d4 minutes. 

The ritual reeks with necromantic energy, and other warlocks are drawn to it like carrion to a recent kill. When the contact is finished, the gems crumble to dust and the skull collapses in on itself.