They are pretty good structures, but don’t do ominous trials until u have diamond armour or protection iron armour. Had to eat a god apple in full prop 4 diamond, when husks with diamond sword cornered me. Still worth it to get many diamonds and god apples from the ominous trials. Just got the heavy core tho
In my personal opinion u should start with a defense build because it is better than attack build when u have the alternate angle frag and spectra parts so u should start with a defense build