Why are some Titans made of stone and others made of metal?
Also is there others who are not stone or metal?
Is there a level of superiority like a ranking system?
And what would the First Ones be made out of knowing that the Death and Titans are metal constructs.
Maybe they ran out of metal and were forced to improvise.
That could very well be and would be an interesting twist.
Mimiron’s soul is saved by the Mechagnomes into a larger Mechagnome.
Odyn already transforms others into Stormforge.
Which ones are made out of metal? Aren’t most of them stone? I thought it was just their servants that were metal/mechanical.
The Titans and gods like them are metal and some titans are stone, its weird but interesting. 
Vrykul, Mechagnomes, Iron Giants.
While they “appear” humanoid, bear in mind that Titans are sentient planets, thus it makes sense for anything derived from them to be metal and rock.
As for the Eternal Ones, they are actually the Shadowland’s equivalent of flesh, and seem more like the Terminator than anything: a mechanical core surrounded by a fleshy external exterior form. How anima somehow lends flesh to machines is currently unknown.
Its interesting, we should of had archeology for these questions in SL
Those aren’t “titan watchers” though.
the ones made of tiny stars.
All the ones in the video were stone. Hope they catch the vandals that broke all of that dude’s friends. He looked so lonely when he realized he was alone.
I imagine the metal titans still have kidneys of some kind, and they all seem really really old.
I imagine Kidney flesh would be a pain for the metal and stone Titans 
Vrykul aren’t Titan Watchers.
Oh, then Odyn and Tyr.
Thought the OP was asking about titan watchers as in titan-forged too.
To answer all of these –
The first generation of titan-forged was divided in aesir, fashioned from metal, and vanir, from stone. They are now collectively known as watchers. A number of them were imbued by the Pantheon’s members with their specific likeness and powers to lead the titan-forged. Those empowered beings were called the keepers.
Everything with ThE FiRsT OnEs is wannabe titan lore.
Personally to fix it all up in a neat tidy bow, I’m hoping it’s a conspiracy created by our titans (The titan shenanigans continue! 
)