[Fantomen]

Whether the "PD helper" spells are worth it depends on the number of provinces you own and if your opponent is a raiding nation that could be hampered by that type of summon. Situational but certainly useful.

I've found mechanical militia very nice when fighting light cloud trapezing thugs, both as a deterrent and actual defence. It makes those vanjarls, early eagle kings, siddhe lords etc. just a bit too fragile to risk with minor equipment. That's worth it in itself sometimes.

I just wish they scaled with PD, that would be cool.