It currently casts regular magic dart spells, instead of buffing the damage. It's nice to have charges, however, without the buff, it feels useless.
The maximum damage on OSRS is Magic level / 6 + 13. At level 77, I could hit 25 on OSRS, however, on Alora I never hit more than 17.
It feels inaccurate aswell, but not entirely sure if that's the case. At the moment, chaos gaunts and tome of fire is stronger than Slayer Staff (e)