The Necroler:
(i am so good with names: Necro[mancer]+[Gao]ler)]
First of all:
I think all "artbreaking" genes, like Shardflank, Scorpion and Gnarlhorns could be part of some mutation and fit nicely as a result of the trials if they Gaoler doesnt have it already and could easily make up as Symbols alone, but dont have to be.
Overall, i did some testing and these Genes do fit somewhat good.
Primary: Bar, Phantom, Shaggy
Secondary: Daub, Breakup?, Hex, Spirit, Streak, Striation, Stripes
Tritary: Gnarlhorns, Scorpion, Shardflank, Thylacine, Weathered, Blossom (Neutralized Ghoul only)
Here some Scries i did:
Necroler1
Necroler3
Necroler5
Necroler2
Necroler6
Not Found
Thylacine is interesting since it pretty much coveres anything that a Secondary Gene brings, so it offers other Secondaries a spot that are normally not part of the Necromancers.
Like Hex & Breakup
Necroler7
Necroler8
Blossom is utterly fantastic in Tarnish! I think Neutralized Ghoul truely profit from it and lorewise it could be part of starting decomposition with the flowers rapidly growing and pulverise to dust/ash within a few days and restart the cycle again.
The dust/ash could have strange properties....the options are quite endless going with it.
Lorewise i think some Necrolers could have split from Icewarden and went to Plaguebringer, seeking help against the Shade with mutations (or tried to free themself of the Shades influence) and the Powers of Necromancers.
This could have happend before they locked themself away of after they got intruduced back to Sorneith, i assume the later because it makes more sense with the lore.
So they are rather new to the Necromancer trials, which explains why there are so few and havent quite found thier place yet, but the unique mutations (Tert) open the eyes for more potential within other races. (aka future ancients)