surprisingly the one i struggled eith the most was the focusing stone and bus not because they were hard but because i kept messing them up. and the easiest one to get was actually spider fang and civil head for spider fang i did it solo with aether shroud and civil head i just did after doing the t3 cursed camo and it took me 2 tries to get u the trial to appear and all i did was wall jump in the middle on each side but you need the wall jump explosion augment on phd.