Originally Posted by OmegaRED^
So will this fully invalidate my waranty?
That depends on your phone whether it has Knox flag or not. You can see this in the stock recovery, with a string called: 'KNOX WARRANTY VOID: 0x0'
If you see such string, that means you phone has Knox, install a custom recovery will trigger and become 0x1 = warranty void.
If have knox and care about warranty and only want ROOT: http://forum.xda-developers.com/show....php?t=2565758
If you don't have knox or don't care, than any other ROOT method with custom recovery can be used.
List or ROMs and Kernel: http://forum.xda-developers.com/show....php?t=2590976
I always prefer the Slimrom myself, as the name applies, it got the least app preinstalled.