Bones Is The Answer
These defences couldn't stop the weakening blasts, nor could they stop the sharp limbs and tails of the melee or the flying types of Silence.
Not to mention the last type was just like the nuclear bombs humans used to make before the apocalypse, just like the type of bombs the research department developed before coming here.
In brief, all the current defences and gears were considered useless.
[Well… To be honest, you got something that can help] but the words he just said made me curious about what artefact I had and could stop these folks.
Was it my Libra? But it was a single target use artefact. Was it my pillar? Was my shields enough to stop these scary folks?
[Don't think about it, I bet you'll never guess what it is]
[Oh! You got my attention dude! Tell me, what is it?]
[It's your bones]
[...]
To be honest, I never expected such an answer. My bones? How were they useful?