From HoNwiki

Riftshards
Cost
2,650
Stats
+45/55/65/75 Damage Passive
Modifier
None
Location
Combative
Dota Counterpart
Crystalys

Recipe

• Broadsword - 1200 Gold
• Punchdagger - 500 Gold
• Riftshards Recipe - 950 Gold

Total price = 2650/3600/4550/5500 Gold

Passive

Level 1: 10% critical strike for 1.8x damage

Level 2: 13% critical strike for 2x damage

Level 3: 16% critical strike for 2.2x damage

Level 4: 20% critical strike for 2.4x damage