Wächterbogen (A) Moonbeam

5-ft- rad, 40-ft-high cylinder
enters area 1st time on a turn or starts its turn
here, Con saving throw. 2d10 radiant damage on
a failed save, or half a successful one.
shapechanger makes sav with disad. Fail, also instantly reverts to its original form and
can't assume a different form until it
leaves the spell's light.
On each of your turns after you cast this spell,
you can use an action to move the beam up to 60
feet in any direction.