This week 9 epic quest requires you to use a shockwave grenade on yourself while you are in the storm.

Unfortunately there is no guaranteed spawn or drop for shockwave grenades so you will need to search everything until you find them. They have a chance to spawn as floor loot or drop from chests, llamas and supply drops.

When you are lucky enough to find some shockwave grenades you will intentionally need to go outside the safe zone into the storm. It's easiest to do this when the storm is waiting and not closing in. Just step outside the safe zone and use the shockwave grenade to push you back into the safe zone to minimise the amount of health lost inside the storm. If you do this as soon as possible in the game the storm will damage you less.