I fiddled around a bit last night and I think I have ToB access figured out, mainly going by Vhon's, Pugger's, and Alla's posts combined. Here is hopefully a clearer access path.
There are basically 3 sets of quests you need to do. They can thought of as the Arcstone series, the Razorthorn series, and the Takish series. This is a revised edition of Pugger's post.
(Arcstone)
AO the Fourthborn
Mission Skylance 1 : The Library
Mission Skylance 2 : The Obuliette
Mission Skylance 3 : The Laboratory
Recieve Tarnished Chime
Give Tarnished Chime to Ao
Recieve Harmonic Chime
Give Harmonic Chime to Arch Mage Galsin(near arcstone port in)
Recieve Silent Harmonic Chime
(Razorthorn)
Mission 1: Saga Skins
- loot any skin from a red con in Devastation to start and then get the other 8.
- turn in skins to Grand Librarian Maelin in PoK
Recieve the skins back, two quest tomes, and your 70th spell
Give Maelin the two tomes to start:
Mission 2: Becoming the Vessel - complete this for Razorthorn access
Hail Grand Librarian Maelin and say "enraged flesh charm"
Recieve Enraged Flesh Charm
Hail Oathmir the Outcast in Devastation and say "can find" for:
Mission 3: Samples of Corruption
Hail Oathmir after completing the mission and say "what chime"
Give Oathmir your Silent Harmonic Chime
Recieve Twisted Chime
(Arcstone)
Give Arch Mage Galsin your Twisted Chime
Recieve Twisted Chime (same name but different lore)
(Northern Ro)
Tak'Valnakor
Mission Ro 1 : The Key to the Past
Mission Ro 2 : Burning Princes
Queen Tak'Yaliz
Mission Ro 3 : Message from the past(70 aura)
Give Queen Twisted Chime
Recieve Twisted Harmonic Chime
(Arcstone)
Give Arch Mage Galsin Twisted Harmonic Chime
Recieve Twisted Harmonic Chime and an AA under general tab called Harmonic Dissonance (same name again but different lore)
You now have access to Theatre of Blood.