Glass Armor
Reflects (tier)% damage back at your attackers, rounded up.
A power of some relic and extradimensional armor and shields. Additionally, 
quartzfur hats, 
quartzfur gloves, and 
quartzfur cloaks are always generated with this mod at tier 5.
For more information about reflecting damage, refer to the reflection page.
Tips
This section is opinion-based. Your mileage may vary.
- Having a source of damage reflection will prevent ongoing damage from enemy
Sunder Mind. - Since reflection triggers every time you're damaged, it allows replacing the "Whenever you take damage..." cooking trigger condition with the "Whenever you reflect damage..." one, which has a much higher trigger percentage.