Shards

Shards are legendary drops which allow players to unlock Skins. They are collected by finishing Assassinations missions after killing the final boss.

See Assassinations for specific mission names and levels.

Drop Rate

This statistics was made to calculate how many Assassinations you need to do in order to have 150
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
9	15
10	15
11	15
12	15

Which give us :

Average	Median	Minimum	Maximum
16.25	15	13	20

Seems like you can drop from 13 to 20 by once. And you get in average 16.25 of them. So you need to do 10 times the Assassination in order to have 150

Done with Dameer 18,49 Might on patch 0.31 in Master on Assassinations : Iron Made > Lord Gvozden