Arena of Valor (AoV) - Staff of Nuul

Staff of Nuul is a somewhat situational item in that its percentage-based magic pierce is most useful when your opponent stacks multiple magic defense items which are relatively rare to begin with (read more about calculating pierce damage or how pierce percentages are calculated). Against opponents with low magic defense, it adds roughly the equivalent of 100 ability power, which you can potentially get with other items, and doesn’t compare with the effect of Soaring Aura when facing squishies. That said, sometimes it’s difficult to reach your opponent’s backline as a mage, so making sure you can damage the easy targets in the front makes sense.

The ability power it offers is decent, as is the cooldown speed, though CDR is a bit more common among magic items.

Recommended Heroes and/or Situation:

Slow mages who have a hard time getting to the opposing backline can play it safe and pick on frontliners with Staff of Nuul. It’s also obviously very useful against multiple tanks who stack magic defense items.