Off the top of my head, I would have said this normally gives 20 energy of Blood of the Stone, but I just got 30 energy from it today (twice). The wiki lists this as "25 / 40" without explanation. Odd.
In the furthest corner of the hall, you find a massive black slab of stone. An endless line of script winds its way around the stone, changing between several different sets of characters.
Where each character is carved into the stone's skin, blood wells as though someone had made that cut into human flesh. But you're almost thankful for the blood, because the unobscured letters buzz unpleasantly through your mind.
You've gained 30 duration of Blood of the Stone.
Crawling Larva (15)
Fae Sight (71)
Bone Spikes (89)
Ruptured Organs (90)
HQ Alarm (90)
Hat: Midgard heavy helmet
Weapon: Midgard MG2
Offhand: tome of binding
Shirt: Midgard heavy vest
Pants: Midgard heavy pants
Gadget: staring blossom