Doom Wiki talk:About

hello, I am playing Doom 3 resurrected. I am stuck, the problem is in the room in erebus dig site. the room has a an altar with a round energy source flanked by two cannons firing fireballs into a uncrossable chasm, the creature is firing fire balls at me. I need to know how to kill it. weapons to use also. Any help is appreciated, as well as a internet access with this info posted. At the present, I cannot find a walk thru for Doom 3 resurrectes. many thanks,