For Sillia Herald faction for level 83 rank 2 spells, here is a very fast way to gain faction (but all tasks can only be repeated every 6 hours, so a once a day thing or couple times a day on the weekend thing). So fast is in terms of time invested.
1) Zone into bloody kith from the Void
2) Head to the good camp down slightly southwest from zone in
3) Say "go" to Armsmastre Vohlen (you have to have finished Acts of Reprisal first once) to get Sacrifice to Treachery
4) Say "know" to Diennic Lightheart right next to Vohlen to get Shadows of Kithicor
5) Turn to Vohlen and hail him
6) Say "help" to Supplymaster Kibrek to get Scourge of Supply
7) Move northeast to the 3 house camp, move around in front of the southeast house to get update, then move south to road near Gedwin's corpse for update, then pick up the 5 bags near him
Head west to Firiona Vie camp, say "accept" to Firiona Vie to get Vengeance and Deliverance (you have to have finished Charges of Treason first once) and an orb of mind recovery
9) Turn to Lord Tethys, say "attend" to get Charges of Treason, turn back to Firiona Vie and hail her
10) Head south to Ladon/Kroneld, get near Ladon for update, then turn to Kroneld and kill the 4 obliteration agents
11) Hail, then kill Kroneld, then hand orb of mind recovery to Ladon, then hail Ladon
12) Head east to Avenwood Hamlet (4 houses), go to door of the northeast most house for update
13) Head to east side of hamlet and go near Endell's corpse on the hill for update
14) Kill 4 Obliteration infiltrators and loot a note
15) Head to northeast corner of kith, evil side, go through Tarith Maul and Feerott Longblade camps (target banners to see which camps they are, the two northeast most camps) for updates
16) Head south from those camps to Lanys' camp for update
17) West of Lanys' camp, kill 5 Obliteration Sentinels (if only 4 up, kill those and move to next part, come back to kill 5th one in a few minutes when it respawns)
18) Head southeast to the houses north of the lake for update, head to the eastmost house for update, go inside, hail Aendra, kill Ralf, loot note
19) Head south, swim to bottom of lake, open chest and loot orb of mind recovery
20) Head back to the good camp you started at in step #2, hand note from Obliteration infiltrators to Vohlen, then hail him for Task Completion
21) Hail Diennic for Task Completion
22) Hail Kibrek for update, then hand him the 5 ground spawns picked up in step 7 for Task Completion
23) Head west to Firiona Vie camp, hand Orb of mind recovery from the chest to Firiona for Task Completion
24) Hail Firiona Vie for Task Completion
25) Head northeast to Old Commonlands, zone over, then go southeast to the old EC Tunnel area
26) Go to Parthar, say "rescue", accept the missions for Dolman, Opal, and Redthorn, if you get Mojax or Fennia versions, decline them, keep saying rescue, if he says "I don't have anything to give you" or something like that, he tried giving you one you already had, just say rescue again
27) Run northeast to the area south of the lake, run through all three camps of obliteration mobs for an update in each one
28) At each camp, pull and kill all the obliteration mobs, when last mob dies at each camp, be near the camp for task update when the NPCs escape
29) Head back to Parthar and hail for three Task Completions
Net time to complete (once you have it down): 75 minutes
Total number of tasks completed: 8
Total number of Chronobines: 255
You also get faction hits from almost all the mobs you kill. You can redo these missions every 6 hours (you can also go get all 8 missions, then not do them, then you can do them 6 hours later then do them again immediately, as your replay timer starts from task acquisition, not task completion). After doing Blood of the Fallen, it took 3 rounds of this to get warmly to buy spells.