Even if they are crushed to paste by a mill, they will still be able to heal themselves back to full health with the Regeneration divine ability. So this divine ability has increased their survivability by a large proportion and filled them with confidence.
They now have more confidence about reaching their ultimate goal of being able to survive till they become an Absolute and being able to survive an encounter with ANNIHILATION in particular.
But they didn't let their confidence get to their head. After all, they saw how the previous rank 5 undying godclad died.
What's more, it was their plan to use a curse to kill the undying godclad. So they promised themselves to always rely on their shields before using their new Regeneration divine ability.