Soul Shards

Usage
Soul Shards are used to make mob spawners. The Soul Shard has to be set to collect a certain kind of souls. This will be done by having the Soul Shard on your hotbar and killing a mob. The shard will only collect the souls from the mobs that the Soul Shard is set to collect. The Soul Shard will only collect souls if you have it on your hotbar.

When creating a mob spawner you need to place the Soul Shard to a Soul Cage by right-clicking the cage.

Tiers
The Soul Shards have 5 different tiers that are determined by the amount of souls the shard has. The tiers have different attributes which gets better by bigger tiers. For example a tier 1 spawner will spawn  2 mobs per 20 seconds and a tier 5 will spawn 6 mobs per 2 seconds.

Making a Soul Shard
Soul Shards are made by cooking a diamond in a Soul Forge and using 8 Corrupted Essence as the fuel. This will yield 3 Soul Shards and take several minutes.

Other
By using an anvil and combining 2 Souls Shards that hold the same kind of souls you will get extra souls. The amount of souls you get depends on the amount of souls the shards alredy have.