Dreamscaper

Fear is the first level's boss and is basically a giant fish. Personally, it took me until my second or third try to be able to beat Fear for the first time, but now I can beat it every run super easy, so don't give up if you don't get it on the first try.

The weapons that seemed to do the most damage against it were fire weapons as they continue to injure Fear even when it goes beneath the water for a little bit.

My recommendation is to get close enough to set off the mines when Fear is near one so that it gets stunned and you can damage it. Make sure when you see a mine about to explode that you dash out of the way or it will injure you too. If it's easier for you, you can also shoot mines with your ranged weapon to be safer, just keep an eye on your lucid bar, as I found I would run out before the end of the fight.

It has four different attacks (how to avoid or protect yourself against them is in paranthesis):

1. Shooting a laser beam from a corner of the map that sweeps from one corner to the other and covers the whole map while Fear is in a corner (to avoid the attack, dodge/roll to the side the laser isn't traveling towards)
2. Shooting a spray of fireballs while Fear is in a corner (can be dodged by either standing far enough back and just standing between where the fireballs are travelling or by holding your shield in the direction of Fear when a fireball is headed in your direction)
3. Tail whip where Fear jumps out of the water, does a somersault mid-air, and slashes wherever you are standing (to avoid the attack, wait until he is just about to slash - you should see a prompt - then dash to the side - not further forward/back along the same line - to get out of the way)
4. This thing where Fear will go under the surface of the water, you will only see a dark circle and your controller will vibrate, and then Fear will jump up out of the water and try to attack you (to avoid, wait until you see a white ring flash around the dark circle, then dodge/roll out of the way)