Get an army of high level imprinting megs. Only need 3-5 but I brought 10 and everything lasted like 10 seconds. But ride on a basil. Mine was like level 40 and I just the leveled him up by killing alfa megs and mg baby megs

If you cant find a basil, ive used a sarco to rush into the artifact chamber, pulled up onto the land portion, and carefully picked off the enemies before grabbing the artifact and swimming back out. Dont use a squid by the way mine got surrounded by alphas and obliterated.

I found it in the opposite cave and it says it’s in the caverns of lost hope???