Megalith Games has another Godslayer preview for you: the Sacred Familiar.
I’d paint mine up all metallic and call him Bubo.
From the preview:
These creatures which are reared in the temples boost the magical powers of Halodyne spellcasters especially due to their ability to channel spells, which allows spellcasters to be positioned well away from the main action.
As a last resort, the magical energy contained in the familiar can be detonated in an explosion.
It is wise to equip every Halodyne spellcaster in the warband with one of these attachments.