pastebin.com/ZHF4VpLp

Need more details if possible.
What were you doing with the core when this started?
What tier is the core?

It looks like something is tracking each block in the structure as they update. Depending on how much extra processing this is adding for each block that could be enough to cause a stack overflow. So do you have any mods installed that may you know of that track block updates?

Also try adding this to your JVM arguments -Xss258m If that stops the error i will know that some other mod is adding extra processing to my block updates. If that dosnt fix it then its probably an infinite loop that i will have to look into.

I'm pretty sure it was some kind of conflict with a part of another mod i was using, the TARDIS mod by DarkholmeKent. I had downloaded a new room schematic, and put an energy core in that room and my game did not like that, but I deleted the core and that room, and I've got three cores throughout the rest of my TARDIS, and they're all fine, so I'm pretty sure the problem was that the room schematic (which wasn't made by DarkholmeKent, but by people who use the mod) wasn't playing nice with Draconic Evolution

Also, it was a maxed out core, as are my other three. Also, out of curiosity, has the draconic tablet bug in the newest version been fixed yet? Because the texture for the armor and weapons in the newest update are badass, and I'd really like to use them :P

PS. I am a huge fan of this mod, and I actually first saw it on a Yogscast series, Flux Buddies 2.0, and it looked amazing, so I tried it out and I absolutely love it! I highly applaud your work on this mod, and would recommend it to everybody :P

Ok so sounds like an issue with the tardis mod or that specific schematic and not necessarily something i need to fix on my end. Let me know if you run into more issues.

Yes snapshot 8 was specifically released to fix the tablet crash. And thanks for the encouragement! Knowing how many people enjoy this mod is what keeps me going with its development!