Weight of 1000 Years

You close your eyes and focus on the Vortex of Time, condensing the memories of the past millennia into a single thought. Originating from a point of your choice within range, you can gesture over the heads of each creature in a 10-foot-radius sphere centred on that point and snap your hand down, solidifying all these memories and forcing them upon the targets, hitting them with agonizing mental damage. Those creatures must make a strength saving throw. On a failed save, a creature takes 1d8 Psychic damage and is knocked prone. On a successful save, it takes half as much damage and doesn't fall prone.

When you cast this using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 1st.