In this thread I will post my findings regarding the Gravelord Servant covenant as there is still very little info on its mechanics. This because I don't want to flood the wiki page with unconfirmed information.
-Level restriction
Same working as summon stone.
I've been infecting in Undead Burg with a SL 6 character. I've been invaded by the regular beginning players, as well as players who invaded me as a Darkwraith several times before and after appearing as spirit of vengeance. Also I have not been invaded by high level players at all.
-"Sign" placement
Either player's current position or place where the Eye of Death was used
Haven't inquired yet where people found my sign but invasions seem more numerous when waiting at the summoning area near the bonfire. Therefore possibly moves around with player. Also due to the lasting effect of an Eye of Death it would be odd if players could only infect one area and would have to use another EoD to infect another area. So therefore I suppose it's the prior option.
-Level restriction
Same working as summon stone.
I've been infecting in Undead Burg with a SL 6 character. I've been invaded by the regular beginning players, as well as players who invaded me as a Darkwraith several times before and after appearing as spirit of vengeance. Also I have not been invaded by high level players at all.
-"Sign" placement
Either player's current position or place where the Eye of Death was used
Haven't inquired yet where people found my sign but invasions seem more numerous when waiting at the summoning area near the bonfire. Therefore possibly moves around with player. Also due to the lasting effect of an Eye of Death it would be odd if players could only infect one area and would have to use another EoD to infect another area. So therefore I suppose it's the prior option.