Acceleration (attack speed)

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Buff (self) · 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 Acceleration Stone (Gain)	Attack Speed +1%	+60 s	10 s
Medium	The middle stone of acceleration (Gain)	Attack Speed +2%	+60 s	10 s
Large	Big Acceleration Stone (Gain)	Attack Speed +4%	+60 s	10 s
Rare	Rare Acceleration Stone (Gain)	Attack Speed +8%	+60 s	10 s
Unique	Unique Acceleration Stone (Amplification)	Attack Speed +12%	+60 s	10 s

In-game descriptions

Small Acceleration Stone (Gain) When equipped on Buff Super Skill which is effective for yourself, ATT Speed will be increased by +1%. (Combined via Instructer NPC)
The middle stone of acceleration (Gain) When equipped on Buff Super Skill which is effective for yourself, ATT Speed will be increased by +2%. (Combined via Instructer NPC)
Big Acceleration Stone (Gain) When equipped on Buff Super Skill which is effective for yourself, ATT Speed will be increased by +4%. (Combined via Instructer NPC)
Rare Acceleration Stone (Gain) When equipped on Buff Super Skill which is effective for yourself, ATT Speed will be increased by +8%. (Combined via Instructer NPC)
Unique Acceleration Stone (Amplification) When equipped on Buff Super Skill which is effective for yourself, ATT Speed will be increased by +12%. (Combined via Instructer NPC)