Decided to do some PvP against the Bell covenant in the more open area. Got beaten by two mages (one at the beginning and one at the end of my run), two other times by the same person, and managed to beat one person then lost immediately afterward to another person who got summoned around the same time.
After my terrible luck, I finally went through more of the campaign. Got to one of the last places in the game. This may be one of the harder places I've gone through other than some areas I went to earlier than I should have. I went through to the end, but then was disappointed when I got there. There didn't seem to be a boss, or even a new covenant to join (from the enemies in the area, I was assuming the dragon covenant was here). I turned off the game and went to look at a walkthrough, and found out that the end had an optional boss I could have fought.
Then stuff got really hard.
The optional boss wrecked me when I aggroed it. I went back by myself and, once again, got killed fairly easily. I tried to get some summons but they got disconnected. Got some more, then got invaded as we got close to the boss. The invader killed me with some BS hex (pretty sure I dodged it before it hit me). Once again used some summons and one guy got killed before the boss. Went in and we got beat. Got some summons again and got invaded in the same area. Started backing up to heal from the NPC damage, then everyone got disconnected.
Was trying to summon more people and some guy decides to invade near the bonfire. We started going at it with melee, then someone I tried to summon earlier finally arrived. The invader got scared (probably thought it was someone from the blue covenant) and got back to start using the bow. I went "bad idea buddy" and used my lightning spears to take him out. Managed to get to the end with the summon, but they disconnected early in the boss fight and I ended up losing.
Tried one more time with summons, got invaded halfway through the level, managed to beat the invader but one of my summons was defeated. Used an NPC summon with the remaining player to face the boss, got beat again since the player summon disconnected halfway through the fight.
Finally decided to quit and will try again tomorrow. Seriously though, that might have been the most invasions I've had in one area. Ironically, it was all after I had gone through the area once already.