So, in Changeling: The Lost, the Contract of Elements allows you to take additional elements at half-cost. Cool enough, this helps hit some builds that might not otherwise be feasible (for instance, a steam-powered clockwork character might take Metal and Fire together or something like that).
So, suppose I take Elements 2 (Fire) and Elements 2 (Smoke) (or some other combination that fits thematically with the character). I then activate Armor of the Elements' Fury for each, once for Fire and once for Smoke, spending the full glamour for each. The description says it "provides" one point of armor, but it's not clear if this stacks.
This elemental sheath also provides the character with one point of armor useful against all attacks, including attacks by the summoned element.
Likewise, it's unclear if the damage provided by this contract would stack (the character "does" the damage.), if it would just pick the most favorable kind, or something else.