Shifting, then castinf
Thorny Entanglement. It's like
Entangle, except that the vines can also attack. The vines have an attack bonus of +9 and do 2d6 damage to anyone who moves within their area. Anyone who moves into their area or ends their turn there automatically takes 2d6 damage. They can also do a ranged attack instead if someone comes within 15 ft. of them.
40 ft. radius spread, concentrated as close to the mansion as possible. If the doors are open, the centre point would be in W-X;12-13, but if the doors are closed, then just outside them.