68.1: A Rogue's Trust
Chat with Meldrek; zone into instanced version of Stoneroot Falls;
kill 25drachnids and loot 4 hearts.

68.2: Scouting the City
Chat with Meldrek; zone into instanced version of Stoneroot Falls;
kill 25 drachnids; kill Warlord Drellek and loot tome.

68.3: Building the Disguise
Chat with Meldrek; zone into instanced version of Stoneroot Falls;
kill many drachnids;
loot lots of stuff; make disguises from loots; kill named.

68.4: The Search for Illsuras
Zone into instance through Stoneroot Falls;
follow Overseer (non-agro mobs) to Commander, then fight them both.

68.5: The Rage of Kelliad
Kill 9 guards and the Prince.

Completed the full series and got the level 68 class specific spell:

Bard - Spell: Creeping Dreams
Beastlord - Spell: Bestial Empathy
Berserker - Skill: Cry Havoc
Cleric - Spell: Death's Regret
Druid - Spell: Skin of the Reptile
Enchanter - Spell: Echoing Madness
Magician - Spell: Burning Aura
Monk - Skill: Fists of Wu
Necromancer - Spell: Call of Blood
Paladin - Spell: Last Rites
Ranger - Spell: Hail of Arrows
Rogue - Skill: Balanced Blades
Shadowknight - Spell: Fickle Shadows
Shaman - Spell: Lingering Sloth
Warrior - Skill: Commanding Voice
Wizard - Spell: Clinging Frost