*Needs a high blacksmithing skill with a high ql door lock.
*Very hard to start and continue.
*Decays only off deed over time (loses Strength and disappears when it drops to 0). Both on or off deed.
*Strongest door available has almost double the resistance of a rock mine door.
*20ql lock gives ~6% chance at 70 blacksmithing, 86ql lock gives ~44% chance at 70 blacksmithing, steel sheet ql does not seem to affect chance.