Shards with the description "Your primary attacks..." apply also on secondary attacks. This seems to be the case on all shards but duo to some shards not working it is hard to test for all. It is easy  to spot on the "Overwhelm" and "Life Leech" shard. This can be used to "abuse" some mechanics of the spheres, like using flamethrower for squire and it heals and stuns all enemys while he still gets the benefit of blocking meanwhile. Also the secondary attacks have multiple projectiles often, and the stun from Overwhelm shard is applied to each of them, this can lead to stunlocking even bosses in C5.

Steps to reproduce:

• start the game
• equip the "Overwhelm" and "Life Leech" shard in your weapon
• use your secondary attacks (preferable NOT abysslord for he has many issues with shards)
• notice that the shards proc on secondary attacks

Expected result:

Shards which say "Your primary attacks ..." only working on the primary attacks.