This might be a spoiler (though anyone watching Generikb's playthrough will already know this) so I will give a few lines of space:
Screw that support creeper you get from the mystery egg. It was all fine until i spawned it in the lower level of my base just so I wouldn't lose it. I then went on a long exploration to see what I could see and got horribly lost. Came back, got my shell constructor working, at less than 50% went down to check on my support creeper and... He had respawned with a stupid set of skills (the annoying boss mob thingy) that caused him to throw potions at me and he killed me. Nuts to you support creeper, nuts to you! And on hardcore too.
Still loving the pack though. Time to see if I can actually get started on any of the paths OTHER than let's get started.