Can you catch them using a safari net/soul vial?(or however the item from enderio made out of quite clear/fused quartz(can't remember which one) + soularium)
Well, I know it's actually possible to contain dragons in Vanilla, using a bunch of pistons attached to fast clocks. The dragon tries to fly out of the cage, but gets pushed back into the middle of the cage by the pistons before it can destroy anything.
However, getting the dragon into one of those cages without it just destroying everything is quite difficult. I've never seen it done- all I have seen is a short clip in a Panda4994 Youtube video showing a living dragon trapped in such a cage. That clip, if I remember correctly, was in the video where he showed off his insanely fast enderdragon-based XP farm, which only requires containing a dying dragon, which is much easier.
That said, I think the way to do it in modded MC would be to try to ensnare the dragon using some kind of force fields. Blocks alone likely won't affect the dragon at all- even if it can't destroy warded stone, say, it would probably just phase through it. After all, the dragon can't destroy endstone or obsidian, yet that doesn't keep it from flying through them in the End.
You'd want to have one containment field to capture and, well, contain the dragons, as well as a smaller repulsive field to keep them from damaging any of the field generators. And then that leaves the problem of how to automatically kill them... RotaryCraft turrets or heat rays, maybe?
Draconium ore? Why not Draconium Blocks or Charged Draconium blocks? If Primal Mana has a dimlet it would definetly work in an world made of Draconium Blocks. Anyway that world looks awesome
If there's no dimlets for Railcraft or Botania metal blocks, I doubt that there would be any for draconium blocks, either. There do seem to be dimlets for every single ore available, though, so I figure draconium ore would probably work, too.
Primal Mana definitely does have a dimlet, though. What does it do to draconium blocks?
Oh shit, son! Reading the code, RotaryCraf'ts containment field can contain a dragon! It needs 2MW of power to do it, but you could contain them! Now, if there were a way to spawn them, then you'd be set...
They spawn naturally when there's less then four or five of them in the dimension, and they like to hang around the dimension spawn point. So you'd just need to set up an interdiction field inside a larger containment field (if you can actually set the ranges of those things; I haven't read the book recently enough to remember), hang out in the center, and let them come to you.
Also, it'd probably be a good idea to set all of that up well above or below ground level. Don't want those portals to destroy your machines, after all.