War Mode and Primal Storms gear are no longer upgradeable by trading gear and upgrade currency and you must spend Valor, Honor, and Conquest to upgrade them in Patch 10.0.5.
(Source)
We have a few adjustments to item upgrades in patch 10.0.5 that we want to outline and clarify.
War Mode and Primal Storms gear are no longer be upgradeable by trading gear and upgrade currency (Trophies of Strife, Storm Sigils) at the previous vendors (Malicia in the Gladiator’s Refuge and Rethelshi in the Sapphire Enclave). These items now use the other item upgrade vendors that Valor, Honor, and Conquest gear have used, such as Corxian in the Gladiator’s Refuge.
War Mode and Primal Storms gear obtained at level 70 prior to this patch will still be upgradeable. However, War Mode gear obtained pre-level 70, before the patch, will not be upgradeable.
New pre-level 70 gear obtained after the 10.0.5 patch went live will be upgradeable.
There’s a bug fix in patch 10.0.5 to The Drakebreaker’s Breastplate. Before 10.0.5, it incorrectly cost 7 Trophies of Strife to upgrade. It now costs 10 Trophies of Strife to upgrade. This was done to make it consistent with other chest pieces.
