Cracked Crystal Skull: A relic uncovered from the depths of the jungle. It exudes a deep darkness.
Mixcoatl the Masked God
This is typically used as low-level feedpower, although some newer players do use it. It notably has the largest area of effect of any skull, making it effective for healing from large clusters of enemies.
The low damage generally makes players choose a tiered or better untiered skull later on.