How to complete Gonarch's Lair?

[RaulMZ]

It is self explanatory that this is a boss fight and the weakspot is the sack, however I am stuck at about the 3rd phase when Gonarch goes down a hole waiting for the player to come down.

So I go down with Gonarch and fall down a slippery ramp trapping me in a enclosed room while Gonarch stays up in a ledge. So I have read some guides that after shooting it enough, Gonarch is supposed to go down with me for the final fight but I have wasted literally all my ammo and Gonarch doesn't come down.

I read in a guide that Gonarch may glitch in this specific part and I think I have that bug as I exaust my whole full revolver ammo, smg(+grenades) ammo, crossbows ammo, rocket launcher ammo, 10 grenades and nothing happens.

[Seekay]

First try reloading an older save so you can redo the fight to hopefully not have the bug happen again.

If that fails you could try a speedrun skip, manually breaking a bit of the floor that normally breaks after Gonarch dies, though that usually requires the use of all your satchel charges and tripmines cause it has a lot of health. If you run out of resources you could also break it with the crowbar though that takes forever.

If all else fails, open the console, type in sv_cheats 1, noclip, and then fly beneath the floor to the teleporter room, type noclip again. You might need to reload a save after typing sv_cheats 1 before cheats become active.