They will attack as soon as you engage in PvP activity around them.

Charge and Incapacitating Shout will render anyone unable to act for the second it takes them to kill you.

Quite amusing to walk through Light's Hope and leave a trail of dead bodies behind you without actually doing anything.

This NPC is very "" look alike"" the guards from the Isle of Quel'Danas.. but if you attack horde / ally here you have 0% chance to survive...because ALL guards in the camp will attack you

this npcs have 121k of health GL trying to kill one.

Apparently, if you attack the opposing flight master or another player in an inaccesable area such as on top of the stump or on the tree they will teleport you to them.

I was just at LHC and there was a night elf druid there. So i /challenge her to a duel and we both walk quite a distance from the camp to kill each other. Well as soon as she rooted me we both were teleported back to the chapel and killed.

These are the end-all of guards in the game. Nothing comes close to the sheer magnitude of defense at Light's Hope Chapel. Engaging in PvP here is suicide unless you can literally one shot a player (a single global) as anything past that and you will be https://vanillawowdb.com/?spell=25821 instantly stunned by 20 guards from 40 yards away. You will die. No, you cannot https://vanillawowdb.com/?spell=15618 heal through it , and you cannot https://vanillawowdb.com/?spell=19643 be healed through it . You cannot https://vanillawowdb.com/?spell=18328 run away , and you cannot https://vanillawowdb.com/?spell=23337 roof camp .

Edit: Came back to Light's Hope on my 80 Holy Paladin in 4.0.1 with 33.5k health. I got a few holy shocks and word of glory casts off, but I lasted about 10 seconds and fell over dead.

Should have seen the carnage these caused during the wrath launch event when everyone got sent to lights hope for the event quests and went clicking each other accidentally while trying to interact with the npcs, lights hope looked like it had been hit by a neutron bomb with all the skeletons.

If one attacks then you can't hit them back, right?

I entered a Warsong Gulch battle while I was at the chapel, and when it was over, I was ported back to the chapel and was immediately destroyed by all of the guards. Is this supposed to happen?

This is what happens when you PvP near them.

http://www.youtube.com/watch?v=31rO2OCTNPo http://www.youtube.com/watch?v=31rO2OCTNPo

Before Cataclysm, they used to teleport you closer to the chapel but now they don't seem to have this ability.

Transmogrification gear set for the Argent Sentry NPC:

Helm: https://vanillawowdb.com/?item=28285 Helm of the Righteous , drops from Pathaleon the Calculator in The Mechanar (N/H)
Shoulders: https://vanillawowdb.com/?item=27739 Spaulders of the Righteous , drops from Laj in The Botanica (N/H)
Chest: https://vanillawowdb.com/?item=30065 Glowing Breastplate of Truth , drops from The Lurker Below in Serpentshrine Cavern
Hands: https://vanillawowdb.com/?item=30112 Glorious Gauntlets of Crestfall , drops from Lady Vashj in Serpentshrine Cavern
Waist: https://vanillawowdb.com/?item=33446 Girdle of Stromgarde's Hope , drops from old school Zul'Aman. No longer available in game. :( A good match is https://vanillawowdb.com/?item=32606 Girdle of the Lightbearer , a zone drop in Black Temple.
Legs: These actually do not exist in game to my knowledge (and I have searched up and down for it. Believe me). They are a silver/gold/red-gemmed recolor of https://vanillawowdb.com/?item=30126 Crystalforge Legguards . A decent match that I'm currently using is https://vanillawowdb.com/?item=45843 Legguards of the Peaceful Covenant , purchasable from various quartermasters in Dalaran for 770 JP. The BEST possible match would -probably- be https://vanillawowdb.com/?item=65227 Reinforced Sapphirium Legguards .
Feet: https://vanillawowdb.com/?item=34947 Blue's Greaves of the Righteous Guardian , purchasable from https://vanillawowdb.com/?npc=27667 Anwehu in Shattrath City and https://vanillawowdb.com/?npc=25046 Smith Hauthaa on The Isle of Quel'Danas for 390 JP
Tabard: https://vanillawowdb.com/?item=43154 Tabard of the Argent Crusade , purchasable from https://vanillawowdb.com/?npc=30431 Veteran Crusader Aliocha Segard for 1 gold (requires friendly rep or higher).
Main hand: https://vanillawowdb.com/?item=21837 Anubisath Warhammer , a zone drop from Temple of Ahn'Qiraj. There are tons of alternatives for this, look under the Same Model As tab.
Shield: https://vanillawowdb.com/?item=62191 Highlord's Favor , an unlisted quest reward from https://vanillawowdb.com/?quest=27155 Turning Yourself In .

https://vanillawowdb.com/?compare?items=28285:27739:30065:30112:33446:65227:34947:43154:21837:621... This is the comparison with all of the accurate items, plus the https://vanillawowdb.com/?item=65227 Reinforced Sapphirium Legguards .

Took me a long, long time and a lot of research to put this set together. Hope this helps some of you moggers out there.