Rant & I gave this a try last Saturday with me providing the black phantom skeletons with my gravelord lvl 110.
Things I learned:
Billy is at a far higher level of pvp then myself. I saw him crush an invader that I had killed earlier, who had been challenging for me.
Gravelording on PS3 on a Saturday afternoon at level 110 is prime. I was invaded constantly by darkwraiths, darkmoons, and of course anyone who could find my sign. It was so bad we had to stop. The only way this can work is with a dedicated gravelord.
People do not like to be cursed in the Tomb of Giants. I have gravelorded in many other areas and find, for the most part, people just ignore my sign. Not in the Tombs. I had two different darkwraiths complain I had cursed their world and when they couldn't kill me as a darkwarith, hunted down my sign to invade me that way.
Fighting black phantoms at new game plus sucks, but fighting them at new game +7 is insane. Rant and I lasted 2 seconds in the divine ember room, even after I did a diving attack with a chaos ziewi that crushed two black and 1 regular. The black phantoms just picked themselves up and stomped me to a pulp.
If you curse a darkmoon and have sin, you are creating a direct link to have him invade you. I had a darkmoon invade me at least 12 to 15 times. I can't believe I was the only person with sin in the tombs. My theory is that his blue eye was acting like a gravelord sign connected to my world. Good news was he wasn't very good at pvp and I won every match except for one in which he had help and double teamed me. The irony... as soon as I hit the eye again, his world was cursed again.