This fear can be exploited as a defense if you find you or your team overwhelmed
As for rain of fire, most people are pleased with rain of fire at first but dislike it in the long run. When activated Cabal online Alz, you raise your arms and a torrent of fire rains down on your foes in a very large AoE, inflicting small tics of damage very rapidly.
The damage is ok /if/ your enemies are held, but otherwise a fear component makes the baddies scatter. This fear can be exploited as a defense if you find you or your team overwhelmed. Rain of Fire has a large bonus to accuracy and basically auto-hits anything you'd reasonably attack.
Level 7: Slots: Fireball [6], Hasten [2]
You have your first 6-slotted attack at level 7! At this level, you’re probably best off with 3acc/3dmg so it reliably hits. Hasten won’t notice this slot much right now, but it’s an investment. You might want to put it in buildup instead, but I weigh hasten as the priority given that it speeds up everything.
Level 8: Fire-breath
You’re second AoE and a great attack. Fire breath does heavy DoT (damage over time) to enemies in a somewhat awkward cone. It is much stronger than fireball, but the damage comes over time, it's much slower to fire, and the cone is harder to use.