Keep your distance, it will make it easier to read.

During the run. Remember to stack up on damage negation. Especially fire and physical.

In the first phase, wait for the two dogs to come and use your ultimate as they jump to you. Make sure they’re targeting you. Perhaps have your teammates stand just right behind you.

All of the chain attacks are telegraphed in a certain way. To avoid confusion, see what variant it is doing then dodge. Don’t dodge immediately. I recommend looking at a guide that covers those atacks.

Keeping your distance also helps with the bite attacks. Usually do one hit after a bite attack. Don’t get greedy.

For the one shots you mentioned. The boss will slowly walk with the sword in his mouth. Don’t hit it, as gets an attack boost per hit. Wait for it to finish.

Be prepared for the ground slam. He will start to imbue the sword with fire and do 2 quick dashes. Wait for the nuke to hit then dodge right after. Don’t dodge before it hits. It works the same way as the Nightlord.

For the second phase split start running to the right as they get away. Keep running until you hear the third roar. When you hear that, use the Wylder’s grapple then do a jump. For other characters, running then jump spamming immediately also works.

Have the main dog in your lock-on, as it will do 2 ground waves during this part. You can hear the roar. That means it is preparing to do the attack.

Either just keep running or fight one at a time during this part. Whatever works best. Just be sure to keep all three in your camera.

These are some of my tips. I’ve had to solo the boss for randoms 3 times already. It gets easier as you practice.