This daily mission is given by the Agency Handler in Old Athens. You'll be instructed to travel to the Omni outpost at 2HO. There you need to deface two Omni billboards and an obelisk. You will be given the following from the Agency Handler.
The goal of this mission is to deface three Omni landmarks all within a fixed amount of time. With your Clan Nano-Spray in hand, proceed to 2HO, which has a Grid exit on the second level.
There are lots of omni guards as well as other Omni mobs between level 100 and 150 in this area. They will attack you on sight. Run forward from the grid exit (more or less due North) and you will arrive at the first billboard on the side of a building.
Stret East Bank - 727.5x1740.4
Coordinates: 727.5 1740.4
Target the billboard and right-click on the Clan Nano-Spray to spray graffiti on it. You will immediately receive a PvP "Flag" upon defacing the first billboard, if you are not already flagged from dealing the lieutenants int he area. You will also receive the first "Graffiti Artist" nano in your NCU. You must have all three "Graffiti Artist" nanos running in your NCU simultaneously to successfully complete this mission.
Turn around and head South towards the mound of dirt in front of the whompahs in the middle of the 2HO outpost. You will eventually reach three billboards. The two larger ones are regular advertisements. It is the smaller one that you are interested in.
Stret East Bank - 774.5x1637.2
Coordinates: 774.5 1637.2
Again, target the billboard and right-click on the Clan Nano-Spray to deface it. You will receive your second "Graffiti Artist" nano in your NCU. Now head West outside the entrance to the 2HO outpost. Just outside the outpost you will see the Omni obelisk.
Stret East Bank - 863.3x1621.5
Coordinates: 863.3 1621.5
Target the obelisk and right-click on the Clan Nano-Spray to deface it and to receive the third "Graffiti Artist". You can turn around and head back into the outpost and use the whompa to 4-Holes or The Longest Road to return to Old Athen.
You must return to the Clan Mission Agency in Old Athen and speak to the Mission Agency Receptionist to receive your reward. He will remove the PvP flag as well.