Who actually sealed Angor rot?
More "()" = more post-thoughts
Spoiler I guess even after 5 years of it ending
My first thoughts: the real question is who sealed(not his soul) angorrot, google(never trust google) says it was merlin but that can't be possible since merlin went into slumber during or after killerhead bridge battle after sealing morgana. And as the series says, he's killed many trollhunters.
Now:
But at some point after killerhead bridge something disabled angor rot from Awakening, angor rots' sole purpose is to eliminate trollhunters. There have been many theories that humans managed to subdue him which is why he was sealed in a tomb surrounded by human skulls, or merlin sealed him (which i mentioned before but doesn't make sense) and it can't be dukesy since be was instructed to stay low by merlin and probably didn't possess the power to at the time.
The logical theory that I came up with is simply that angor rot only awakens under morganas' orders. Some may think this doesn't make sense since trollhunters are chosen almost instantly since we only saw Jim obtain it after the night kanjigar died, but it could be possible restrictions were put in place by morgana(angor rot) to prolong it.
(Actual final point) Angor rot could only be awakened by morgana(or his own soul,through the inferna copula), but as time continued her power dwindled(requiring someone to also re-awaken/an anchor to the spiritual plane). At first it didn't make sense why angor rot using the shadow staff didn't re-awaken morgana(he just used it as a simple tool never using it to its absolute potential) but as we've seen throughout trollhunters and wizards Claire has shown a great affinity for magic allowing morgana to gain a spiritual form through the shadow realms power(an object tied to her power/origins)
Also through past trollhunters souls we can tell that not all of them were killed by angor rot.
A few:
Spar, "The Spiteful" : First troll to meet an Akiridion(didn't die to ar)(also said to be 5100 years before Jim which doesn't add up unless there was a previous amulet which there wasn't)
Boraz, "The Bold" (unknown)
Last known fighting gum gums but that still also doesnt make sense since they were all trapped in the darklands (unless some remained(like bular this makes sense they died and couldn't be reanimated which is why bular was alone overtime(
Maddrux, "The Many" (unknown)
Unkar, "The Unfortunate" (slipped in spikes and killed by bular)
(One or the only one left of gunmars army on earth(excluding changlings)
Grimbald, "The Grave" (unknown " the grave" assuming he died normally definitely wrong since trolls live long)(unless he was already old being chosen as a trollhunter) ( which is possible, vandal is old but not as agile, but we've seen other old beings like the jade troll( in the movie (time orb) (although wasn't a fighter)
Magmar, "The Molten" (unknown)
Araknak, "The Agile" (unknown)
Tellad-Urr, "The Terrible" ( became evil which is where the amulet could've been withheld meaning no angor rot, but joining angor rot doesn't mean not staying on earth, and also the amulet would choose a new candidate)
Gogun, "The Gentle" (only known hunter to die from very old age( from this we can assume trollhunters were chosen regardless of age (so far older than deia and others)
Voltar, "The Voracious" (stepped on by a creature "thrall")
Voltar was apparently born with two minds. On one of his Trollhunting missions, he was stepped on by a Thrall.
Deya, "The Deliverer" (died to bular indirectly (here comes the sun)
Kanjigar, "The Courageous" (deya stops drall from helping deya against bular(free amulet) and deya dies, its clear kanjigar by far lived the longest (during the time as a trollhunter), entrusted with Gaylen's core( 3below) , created the deep(troll market)
I went a bit off track, so basically morgana was too weak to awaken angor rot which is why there is a long line of trollhunters that were not killed by him (also those who were killed by him wasnot mentioned, but the other trollhunters were still aware of existence so thats a clear sign that he appears and disappears over periods of time) = Morgana (technically)
New theory: others obtained the inferna copula allowing them to control him, making sense why he's in a human tomb(or just a tomb filled with human skulls) (i feel like this may have been mentioned in the series at some point)
Let me know your ideas