I came across one indoors somewhere in DC, I think it was in the Jefferson Memorial basement (can't say entirely for sure.) He tore me up the first time. I had maybe 50-60% health and within a couple seconds I was dead. The next time I went after him, he managed to survive two bottlecap mines before falling. This one happened to have the tri-beam laser rifle which plays sorta like a laser shotgun.
^ yea i know what you mean. my first encounter with one was in one of the dc tunnels where you come across some ferals and roamers behind a locked gate. i didnt notice the reaver until it threw that green ball at me. i treated it like a glowing one until i saw it's hits were dealing a good one-fifth of my health per hit. then i panicked with my flamethrower D:
that tunnel batle you mentioned was also pretty scary, my incinerator wasnt doing much damage to them so it was a tough fight
And lo' suddenly man discovered he had a boner, and he could bludgeon small mammals to death with it. - _Krau
ever been gang raped by ghoul ravagers? no? well i had that little pleasure, oh and to top it off one of them was glitching, i went in with fawkes, charon, star jones, and clover... only i made it out. WHYYYYYYYYYY