From here:
"High Level Armor Sets - 101

Did you know that there are a total of 19 sets of armor available for each career? These armor sets can be found throughout the Warhammer world, and at higher levels can be incredibly helpful (if not imperative) for certain encounters. For example, the highest end sets feature special resistances called Wards. On these high end sets, there are five pieces of armor which grant a 10% reduction in damage per piece when worn in specific endgame encounters, for a possible cumulative 50% reduction. With these set pieces, players can emerge victorious from what would otherwise be much more difficult battles. The five pieces of armor in these high end sets which feature the Wards are: chest, boots, gloves, helmet and shoulders.

Lesser Ward
Bloodlord Armor Set
Found in: Bastion Stair
Requirements: Ranks: Ranks 37-39

Annihilator Armor Set
Found in: Tier 4 RvR
Requirements: Ranks: Ranks 35-39 and Renown Ranks 31-35

Both sets can be used in any combination to offer the Lesser Ward, which is required for City High Level Dungeons and Fortress encounters. There are five pieces of armor in each set.

Greater Ward
Sentinel Armor Set
Found in: City High Level Dungeons
Requirements: Rank 40

Conqueror Armor Set
Found in: Fortresses
Requirements: Rank 40 and Renown Ranks 45-50

Both sets can be used in any combination to offer the Greater Ward, which is required for both the Lost Vale and the City Invasion PQs. The Sentinel and Conqueror sets also provide the effects of the Lesser Ward. There are six pieces of armor in each set.

Superior Ward
Darkpromise Armor Set
Found in: Lost Vale
Requirements: Rank 40

Invader Armor Set
Found in: Invasion PQs
Requirements: Rank 40 and Renown Ranks 55-60

Both sets can be used in any combination to offer the Superior Ward, which is required for Sub-Boss PQs. The Darkpromise and Invader sets also provide the effects of the Lesser Ward and Greater Ward. There are six pieces of armor in each set.

Excelsior Ward
Warlord Armor Set
Found in: Sub-Boss PQs (in cities while contested)
Requirements: Rank 40 and Renown Ranks 64-70

The Sub-Boss PQs are the only means of acquiring the Excelsior Ward which is required for the King Fights. The Excelsior Ward includes the effects of all previous armor sets. There are seven pieces of armor in this set.

Supreme Ward
Sovereign Armor Set
Found in: King Fight (in cities while contested)
Requirements: Rank 40 and Renown Ranks 73-80

The Sovereign armor set is the highest level armor set, and includes the wards from all previous sets. There are eight pieces of armor in this set."