Placed a large static core

[Zireaa]

The core is to high I can not reach it  to enter build mode 

[w1r3dh4ck3r]

I've done that before, if finding a friend with a Magic Carpet type of craft to help you is out of the question you can just stack dirt up until you get to it.

[Emptiness]

12 hours ago, Zireaa said:

The core is to high I can not reach it  to enter build mode 

Did you not automatically enter build mode when you placed it? Usually when a core is placed, build mode is automatically entered. By using the move element tool, the core may be moved within the build area wherever desired, even near an edge or corner.

[Zireaa]

I messed up I had no material on my so I exited build mode I should have Moved it I was able to just remove it and replace I think you shuld be able to enter build mode from farther away though