Drachenhorn gives slightly more attack than Twilight Helm for most of the DDs that can wear it, but it doesn't have CHR or AGI for random relic WS mods. It is generally worse than Mekira Oto +1 for STR modded WSs, even ignoring other options.
PLD, WAR, DRG, BST, SAM, and DRK use:
Requiescat (MND), Atonement (nothing), Vorpal Blade (STR), Ukko's Fury (STR), Upheaval (VIT), Drakesbane (STR), Stardiver (STR), Rampage (STR), Ruinator (STR), Kaiten/Shoha/G/Y/K (STR), Ageha (CHR), Resolution (STR), Scourge (MND/CHR), Catastrophe (AGI/INT)

So it is actually only good for two of the WSs that those jobs can use. It's not really a very good piece, but it looks cool.


Sanus is pretty worthless. Again though, if you were an FFX fan it might look cool.

If you consider O.chain or Aegis obtainable then either is better than Adamas, but it is unclear to me that Adamas is working properly.

Tessera Saio is a good WS piece for Exenterator, Mercy Stroke, Wild Fire, etc. with the downside that it's ugly as sin.

Plenitas is a decent Meteor/Shattersoul staff.

Hyaline Hat is 10% Fast Cast, but so is Nares Cap. It has some nice MAcc too, though. This is honestly one of the most useful pieces from Provenance Watcher.


Body abjurations:
Generally, the NQ is worthless and the HQ is might be useful if the augments were good and you got lucky.