I would suggest the Бulgariaи™'s answer. But as long as you've asked about the emperor lordakium than i assume that none of these noobs so far has done the Hades Gate

,no offense, it's a pretty simple trick, think of emperor lordakium as a falling balloon, and dont let it go in radiation zone, coz it'll heal itself up, just shoot it from the opposite side to prevent it to go to radiation zone.