Iron wall (critical damage reduction)

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Buff (self + party) · Cooldown added +60 s · 5 stones

Stones of this family add +60 s to the super skill's cooldown; the item description does not say so. (Verified)

Tier	Stone	Effects	Cooldown added	Duration (Unknown)
Small	Small stone iron wall (Reinforcement)	Critical damage reduction +2%	+60 s	10 s
Medium	The middle stone of the iron wall (Reinforcement)	Critical damage reduction +4%	+60 s	10 s
Large	Large stone iron wall (Reinforcement)	Critical damage reduction +6%	+60 s	10 s
Rare	Rare Iron Wall Stone (Reinforcement)	Critical damage reduction +8%	+60 s	10 s
Unique	Unique Iron Wall Stone (Reinforcement)	Critical damage reduction +10%	+60 s	10 s

In-game descriptions

Small stone iron wall (Reinforcement) When equipped on Buff Super Skill which is effective for yourself and your team, Reduce Critical Damage will be increased by +2%. (Combined via Instructer NPC)
The middle stone of the iron wall (Reinforcement) When equipped on Buff Super Skill which is effective for yourself and your team, Reduce Critical Damage will be increased by +4%. (Combined via Instructer NPC)
Large stone iron wall (Reinforcement) When equipped on Buff Super Skill which is effective for yourself and your team, Reduce Critical Damage will be increased by +6%. (Combined via Instructer NPC)
Rare Iron Wall Stone (Reinforcement) When equipped on Buff Super Skill which is effective for yourself and your team, Reduce Critical Damage will be increased by +8%. (Combined via Instructer NPC)
Unique Iron Wall Stone (Reinforcement) When equipped on Buff Super Skill which is effective for yourself and your team, Reduce Critical Damage will be increased by +10%. (Combined via Instructer NPC)