Thor Mjolnir Strike is a new Mythic that has been added to the game in Fortnite Chapter 2 Season 4. This Mythic will allow you to call down a blast of energy from the Bifrost, dealing a lot of area of effect damage to any enemy caught in it . It will also disintegrate cover, making it a great way to destroy enemy constructs.
To get Thor's Mjolnir Strike you will need to go to one of the Quinjet Patrol areas. Quinjets fly past the Battle Bus at the start of each round, and one will land at each area marked by blue smoke. These are very easy to spot from the bus, so pick one you like and head there when you jump off the bus.
These spots are patrolled by Stark robots, armed with special laser weapons. Take them all out, or shoot them down and hack them by interacting with them, and make sure you have control of the area. Now is the time to shoot down the flying little drones.
These drones can drop all sorts of useful items, including Thor's Mjolnir Strike. It is a mythical object that will cause a powerful explosion of energy on the map. It will take up a slot in your inventory and have a half-minute cooldown. To use it, select it as you would a weapon, then hold down the first button. You'll see a bright blue circle appear on the ground that shows where the energy beam will hit. Aim where you want to hit, then release the fire button.
It's worth noting that enemies won't be able to see where Thor's Mjolnir Strike will land until it hits the ground, so you can easily catch enemies off guard.
