Episode 1 is primarily an Akrid infested episode and consists of three chapters with two bosses, Chryatis Queen (1-2) and Gordiant (1-3).
Episode Boss – Gordiant
Gordiant is the Episode Boss for Episode 1, and is a huge 6-legged beast. Despite his size, he is relatively easy to defeat. You can deal damage to him multiple ways – by shooting and destroying his regenerative legs, destroying the “core” on his back, or by attacking the “core” from inside his body. By far the easiest of these three options is to destroy his legs. To do this, you can use any of the weapons and VS weapons scattered across the area, or you could use either the GAH-42BS Bleed VSs or the GAF-15D Drion Multi-seat VS (which can be found in the previous area). Using either VS is a much better choice, as you can inflict much more damage, much faster. Once you destroy two of his legs, he will collapse onto the ground, and from here you can enter his mouth. From inside, you can attack his core to do decent damage, but will have to put up with Akrid whilst inside. Beware, if you do infiltrate his body, the only way out is through his tail, and by doing this you will get heavily damaged. You can basically rinse and repeat the above-mentioned tactics, whether you decide to focus on his legs or infiltrating his body and kill him with relative ease.