What component can cap passthrough voltage?

If I had a current of say 100,000 volts at a low current (5mA) and I wanted to drop the voltage to 20,000 volts at the same current how could I do that? Will a voltage regulator do this? Are there SIDAC's at these high voltages?

Thanks.

The 100,000 V can be lowered to 20,000 V by using two resistors in a voltage divider circuit (in series).

Example :

(+)100,000------------------------/\/\/\/\/------------------A-----------------/\/\/\/\/----------------------(-)

For the current to flow above to be 5mA; 100,000 divided by 0.005A = 20MΩ
The sum of resistance-left plus resistance-right is to be 20MΩ

For the point A to be 20,000V, that would be the voltage across resistor right.
The resistance-right value is then 20,000 divided by 0.005 A = 4MΩ

The resistance-left value is then 80,000 divided by 0.005 A = 16MΩ

All calculations use Ohm's law.
So, the voltage at point A is now only 20,000 from a source of 100,000 V

-If that is what you asked-

Don't think there is any regulator or component that can operate at those high voltages. You would need to use resistors as Externet posted.

Thanks for your help.