The House of ShadowLore
“Beucephalus, The Wonder Horse. May the flowers grow ever greener where he trods.”
The crypt has a larger door than all the rest. A nightmare inside rears up when the door is opened. The nightmare’s smoking breath obscures vision. This is Strahd’s steed. It usually leaves by flying up the shaft in the spiral staircase, K18a High Tower Shaft.