Shards

Shards are legendary drops which allow players to unlock heroes and skins. They are collected by finishing assassinations missions after killing the final boss.

See Assassinations for specific mission names and levels.

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Drop

This statistics was made to calculate how many Assassinations you need to do in order to have 150 Shards. So you can buy the Legendary Skins

Try	Shards Dropped
1	13
2	20
3	18
4	15
5	18
6	16
7	15
8	20

Which give us :

Average	Median	Minimum	Maximum
16.875	17	13	20