Trail of Bones

Draw a hexagon on the ground using chalk, place the bones at the center of the hexagon and begin a 20-minute chant. When the chant is over, a path of bones will appear, whit a width of 15ft. and a length of up to a 150ft. You can choose the direction, angle, and curvature of the path. If the path is made to be vertical any climb checks are made at disadvantage. The path is not indestructible but will attempt to restore itself to its original condition, wrapping around any object caught in it. Any hostile creature that moves along this path treats it as difficult terrain. If you decide to cast "Spinal Stairway"  while you are standing on the path, you can cast it with a lv 1 spell slot instead. This spell lasts for 3 hours.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, increase the range by 100ft and the duration by 1 hour.