These buffs give you more toughness for an area of ~30 feet around you while taking aion kinah away the same amount of toughness from enemies in the same area. Like the above auras, these can also applied to your group members within radius. These auras are best used while the Chosen is the main tank.
The extra toughness really makes you a steel wall, reducing damage dealt to you; not significantly, but enough to make a difference both in RvR and PvE. You should activate these auras while in the front lines of RvR or when you are the main operating tank in a PQ/lair. Also, while auto-running through a zone to get from point A to point B, it is wise to use these auras to reduce the chance you get aggroed by mobs and consequentially killed.
While the buffs don't actually reduce aggro, it does make you less likely to be chopped down by a mob of 5-10 critters. Also, in the event an RvR battle concludes in your side having twice as many people as the other side and you end up chasing them back home, don't be afraid to switch over to your Dread auras or even Discord auras for the DOT boosts - the enemy is fleeing anyway so some more DPS can't hurt.
•Main tanking.
•RvR front line tanking.
•Travelling.
•Last resort aura-switch (fleeing from a fight, switch to Corruption as a last resort - it may save your life).