Could have a lot of fun with this! Just looking at SB primal ones (because we all love that 5% drop rate!)

Stormsplitter - Deals high physical damage to a single target and applies Vulnerability Up for 15s.
Source: Susano

Divine Denial - Moderate radial damage + knockback to all affected targets.
Source: Lakshmi

Hypernova - Deals high fire-aspected damage to a target and reduced damage for each additional target around it.
Source: Shinryu

The Roar of Thunder - Deals thunder-aspected damage in a radial area around the user, potency increases with the user's HP.
Source: Byakko

Phantom Flurry - Deals several mid-damage physical hits to a single target.
Source: Suzaku

Cursekeeper - Afflicts a target with "Karmaic Curse" for 10s. All damage done during this time will be applied to all enemies in a short radial area from the target when the timer expires.
Source: Seiryu