You decide the best way is to take the straight forward approach and just overwhelm the dean. You raise more nearby bodies and add them to your tireless horde. As they march down the corridor, you stand near the end of the corridor figuring, if the dean comes out to cast a fireball he won’t get you. However you severely underestimated the dean.

He does indeed come out from behind the corner again and he casts a very powerful version of chain lightning, it zaps through your troops, not really doing anything except halting them briefly and rattling their dead bones, however when the lightning reaches YOU, you feel the effects a lot more severely as every organ in your body is fried and your skin is charred black.

You fall to the floor dead and your horde soon follows.