In T_D, we currently have two full sets of Telvanni Guard armor: the Molecrab set and the Cephalopod set.

However, most generic Telvanni guards and named guard NPCs are using mismatched armor sets.

There's two variants of the guards (and some exceptions, of course):

1) The guards that are wearing the full Molecrab set, except with a random helmet from the T_Mw_Random_ArmorHelmTelvGuard leveled item pool, which has a 66% chance to give the guards the Molecrab helmet and a 33% chance to give them the Cephalopod helmet.
2) The guards that are wearing the Armun-An armor set, but with the (non-random) Cephalopod helmet.

Considering we have designated the Armun-An armor specifically as a Hlaalu set, for the second guard variant it would make sense to replace it with the full Cephalopod set. I also suggest we should give the first guard variant a non-random Molecrab helmet, so they are always wearing the matching Molecrab set.