how to make a general immortal

[/dev/null]

not dying and not aging, so I can keep him throughout the campaign?

[Myrddraal]

Don't know sorry.

[Ptah]

Dip him in the river Styx.

Except, dip his heels too. Don't do the stupid thing Achilleus' mother did.

[eadingas]

Make it a very short campaign.