Please remember that Kaboom cannot ferry more PL in troops than he has total PL.
That's in the 300 to 350 range, I do believe.
A large number, but the Shade have a large army also.
They are entrenched, have the advantage of the Shade (+ 2 / + 2), the advantage of being on the defensive behind fortifications (0 / + 1), and they have bonuses for their value in the Industrial Arms Race to boot.
Kalanyr's forces may teleport in, obviously, since he has 10th level magic (and the Shade do not get their defensive (0 / + 1) against his forces.)
But the rest of the attacking army, beyond Kaboom's number I spoke of, is going to have to arrive some other way.
Also, I cautioned you - and I will caution again - that attacking Shadow Throne directly with the Sky Ships and Flying Citadels of Kaboom puts you at a special disadvantage.
The Shade are expecting such a tactic and have prepared especially for it.
Because they have, I am giving them an extra (+ 1 / 0) to their rolls against any assault from the air.
And there will be extra casualties on the offensive side, due to Flying Ships and Flying Citadels that were shot down before they could land their troops (and thus, all the troops perished in the crash.)
- - -
Yes, Kalanyr, the Shade weapons can penetrate the Mountain's defenses.
10th level magic gives your forces a (+ 2 / + 2) advantage.
The Mountain and it's Mythal gives them another (+ 2 / + 2) advantage.
But it does not render your forces impervious to attack.
Kalanyr, you can only ferry your own attack force on the mountain.
It is simply not big enough to carry the forces of Forsaken One and Festy Dog, or your other allies.