In-game Description:

"After the repeated experiments in controlling the scourge of beasts, the gentle "Embrace" rune was discovered.

When its implementation failed, the "Embrace" became a forbidden rune, but this knowledge became a foundation of the Healing Church.

Those who swear this oath take on a ghastly form and enjoy accentuated transformation effects, especially while wielding a beast weapon"

Information:

>When equipped, it transforms the player into "The Ghastly Beast."

>This is one of two Covenants that involves transforming the Hunter into a non-human form.

The other one is the Lumenwood Kin Covenant.

>The Hunter receives a permanent Beasthood meter only when using the Beast Claw, transformed or not.

>It also radically changes how the Hunter behaves, both in movement and when attacking, but only with the Beast Claw. (Backstep & rolling looks quicker - needs testing)

>Most noticeably, the Hunter will howl and screech like a beast when attacking and doing certain movements.

Location:

Defeat Laurence, The First Vicar.

Source