[Crawdad]

North Freeport (Knights of Truth) are at war with West/East Freeport (Freeport Militia). Killing one side raises faction with the other. Kill enough WFP/EFP guards and you'll be (relatively) safe to bank in NFP.

Guards are honestly not that great of a duo target, mostly because there's seldom enough of them in a given area to have constant pulls.

Edit to add:
Nekt Forest guards/golems 12-34 (levels vary greatly, terrible respawn time) - Waste of time.
EC guards 24-29 - Two targets.
WC Guards 29-34 - Two targets.
WC Druids 29-34 -Assorted druid guild factions, you should be KoS anyways. Fear kite em.. but only two targets.
EC Druids 29-34 - Worse drops than WC druids. Again, only two of them.
HK Guards 29-34 (HK guards are Corrupt and similar to and allied with WFP/EFP guards, will not effect NFP banking). Usually camped these days by rangers/monks soloing.
Misty Thicket Guards 29-34 - RV will hate you harder? Very few guards (7? in zone, usually split between 3 people).
SK Treants (goodly but not technically guards) 29-35 (Effects Druid ring porting in.. you're probably already KoS)... two targets.
HP/HK ent Guards 34-49 - This might be a viable duo spot as there are so many guards.
Butcherblock Guards/NPCs 44-54 - Shorties hate Ogres/trolls already. I believe there's a few different camps here.
Felwithe, or Kelethin Guards 49-54 - Felwithe guards will LoH and heal if melee'd or when fear breaks. 7 in Felwithe B, ~13 in Felwithe A if you know where to look.
Kaladim guards 49-56 - Inside Kaladim might be a bit tight for you guys, however this might be another good duo spot due to the number of guards (18 total in zone I think..?)

Honestly, I don't expect anywhere besides Kaladim and HK being worth it for you guys. Almost every guard camp is limited in number of targets.. I made my Necro with the intent of leveling solely off guards. Its a lot of time spent waiting on respawns at nearly every camp-- and you guys can't even go after some of the best guard targets (Oggok, Grobb).