1. thats an armour slot. like with weapon enchantments you can put a soulforge to give you extra survivability etc you get them from epic dungeons
2. i heard arpen is good on rogues and then crit and power/recov
3. deflection isnt affected by arpen and is a straight 75% reduction in damage taken whereas defence does grant you mitigation but arpen reduces that. as a rogue id go with deflection > defence
4.no you cant + your armour i dont think. you can reinforce t2 arms if you have a high enough profession skill but thats it.
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2. i heard arpen is good on rogues and then crit and power/recov
3. deflection isnt affected by arpen and is a straight 75% reduction in damage taken whereas defence does grant you mitigation but arpen reduces that. as a rogue id go with deflection > defence
4.no you cant + your armour i dont think. you can reinforce t2 arms if you have a high enough profession skill but thats it.