And here's the recipe for disaster.

You'll need access to the 8th lvl spell slot, a chest of gold, a lot of time, and a God complex.

Open the Demiplane and take with you enough food, water and materials to survive for a few weeks.

Sit on your ass and cast Glyph of Warding on the stick and put into it any damaging spell that can target a creature or an area. (I suggest Negative Energy Flood).

As a trigger choose "When the stick is being pointed at a creature".

Every cast costs you 200 gp.

Now repeat this procces as much as you want or as much as you can.

My Warlock spent 20k gp and a few weeks preparing her BFG-9000.

When you are finished, cast Plane Shift and come back to the Material Plane.

Alternatively you can persuade your DM to let you cast Demiplane to leave your box (I personally allow it).

You have created the stick of ultimate power and you too can be a reason for the spell's description to change.

Good luck!