Completing it on hard mode should give you a quest, that when completed gives you a 4th subclass, A SIVA SUBCLASS OMGOMGOMGOMG
[spoiler]OMGOMGOMGOMGOMG[/spoiler]
( ͡° ͜ʖ ͡°)
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I've been saying a while we should be able to infuse SIVA to a chosen Subclass somehow