1-4

1-4 starts off right after the exit from 1-3. You go down a ramp and around the corner to approach a barrier and 2 braziers. On Beyond Mode, it's best that you kill everything before lighting both braziers.

Enemies: Dark Rogue, Dark Knight, Darkfire Cannon, Dark Captain, Dark Paladin, Invoker, Dark Assassin, Exile (only on Beyond Mode), Phantom Rogue

Dark Rogues will be right in front of the ramp. Kill them and right down the ramp is three Dark Knights and a Darkfire Cannon. Kill the Dark Knights first so they don't possibly trap you while attacking the cannon.

Right ahead is a Dark Paladin with two Dark Captains. The paladin is a major damage dealer, so kill them first. Afterwards is an Echo, which gives everyone +5 stat points to use. Directly ahead of the Echo is an Invoker surrounded by 3 Dark Knights.

You will then find 4 Dark Assassins. Right afterwards are 6 Dark Knights and 2 Darkfire Cannons. If you're with multiple people, your best bet is to have some of you attack one cannon, while everyone else attacks the other.

Then are 6 Phantom Rogues and 2 Invokers. Right behind them are the braziers. Light both of them and you can proceed to 1-5, where the first boss awaits you.

Beyond Mode

An Exile will be right behind the Dark Assassins. This champion is very difficult. As its description says, darkfire attacks do not hurt it. Not the best idea to have a Shadow who has possessed a Dark Paladin. It creates a large group of Spawns to swarm you, and also charges up to unleash four waves of fire that partially zig-zag as they travel. The Spawns are going to make you unable to run from the flamewave, so try not to let that happen. A single flamewave deals 100 damage, but also leaves a temporary fire trail which will damage you over time if you're not an Elysian Dragonhatch. Don't get directly in front of it when it's charging up flamewave, or else you will take 400 damage, enough to seriously hurt or even kill people. If you get close, the Exile will start running away, so if you can slow him down, that would be good to do, especially if someone is a melee hero.

There is still a chance that a Dark Redeemer will spawn here.

Do not light the braziers until you've killed everything, as once that happens, this time the barrier won't disappear, and 3 Exiles will spawn at the bottom of the area. The Spawns will be super annoying with possibly 3 big waves of them being spawned and completely restricting your movement. Try to keep good distance between the Exiles, but always watch for when they're casting flamewave. Once they're all dead, the barriers finally disappear and you're ready to fight the Praetor on Beyond Mode.