When you give the Medusa 10 levels in Warlock

THE PARTY DESCENDS DOWN A STAIRCASE AND FINDS A DERANGED MEDUSA; THE MEDUSA ATTACKS THE PARTY AS THEY FLEE; THE MEDUSA CAN EASILY BE SHOVED DOWN THE STAIRS FROM THE TOP; THE MEDUSA CAN EASILY BE SHOVED DOWN THE STAIRS FROM THE TOP; THE MEDUSA IS A LV 10 WARLOCK WITH ASCENDANT STEP