Where can I find a giant ancient core?
Sort of uncommon??? I killed every guardian in Hyrule Field and didn't get a single one until several guardians later. =P Yeah you'll basically want to save all of your guardian weapons for hunting down guardians if you want to farm cores.Guardians that drop ancient cores may occasionally drop a giant ancient core. Cores are already sort of uncommon so you may need to make killing guardians a routine.
I'm almost there to the master sword ,l looking forward to it for sure!