Best way to get in range.

[Cor2]

You might want to give them some stout body guards if you do what gandolf is suggesting.

Maybe we are going about this the wrong way. Maybe you should make the Eagle Kings come to you? Maybe rage, any other ideas?

[Xietor]

Simple answers:

rings tamed lighting; script mages to cast resist lighting,
and later in the game, cast storm warriors.

use diversions. chaff. cast summon elemental.

Caelum has low hps. do spells that target all units on the battlefield(rain of stones etc).

[sum1lost]

Mist? Acid storm? The poison spell which makes it come out of the ground?

[Sir_Dr_D]

All the speels that affect magic beings only are short range. There is none that will help you here.