1st stage: shoot the tentacle, right from were it spits
2nd stage: just shoot the core, try aiming to it's head, don't know if it does more damage, but just shoot.
But yeah, you need some ammo to bring it down.
Viewing post in Syahata's bad day(v1.0.5) comments
i agree with you.. it took me 3 Mags of AR to kill the first stage. and idont remamber the 2nd stage but i think its also 3 mags.
Aslong you hit the Tentacle on the first stage and the Head on the 2nd stage, u will be able to kill it fast if you spam bullets to those area. hitting the body will take more ammo and time