Flamestrike
Legend
The Dwarf eyes the stonework (Stonecunning is ruled to apply here, it WAS a Dwarven fortification after all), and turns you you stating that Dwarven walls and door are likely a few feet thick at a minimum, and it would take hours to break through even if the party had the appropriate tools; the ritual will likely be completed by then; and thats presuming the noise of such an endeavor would not alert the entire complex to their presence as is.I will gather the group over and show them the spot. "Its here everyone, though magic was used to cover it up, the entrance is still here, we just have to find a way to break through the rock. I shall provide us a fortification that will hold off intruders while we work, but we will need to muscle to break through".