Palskane said:
Yes, they certainly lack battlefield control and utility spells.
I don't have the PHBII. Maybe something else I should try to remedy soon.
Against an opponent like an FB, battlefield control is kinda key. Plant Growth is a lovely one. Another option would be Tanglefoot Bags: even if they save, their movement is still reduced. Grease would be a beautiful option - you can't make
any dex-based skill checks while frenzied, which would include balance - unlike rage, where you still can. But as has been mentioned, no grease available.
Given that the guy's strength makes hitting very easy, change things up. Sure he's so strong your AC is irrelevent, but no amount of strength helps negate concealment. Obscuring mist, blur, displacement, etc.
Calm Emotions ends rage. I could see where, by extension, it would end frenzy as well.
As has been stated: you're not just fighting the guy, you're also fighting his frenzy duration.
Spells that'd help, by category. PHB only atm~ Personal faves are bold.
Cleric: Obscuring Mist (1),
Calm Emotions (2), Hold Person (2), the
Dispel Magic (3)/Shatter (2) combo on his weapon,
Bestow Curse (3) - the down side is you've got to get close, Deeper Darkness (3), Air Walk (4)
Druid: Entangle (1), Obscuring Mist (1), Fog Cloud (2),
Plant Growth (3),
Sleet Storm (3), Spike Growth (3), Air Walk (4), Dispel Magic (4)/Rusting Grasp (4) combo
Sorcerer/Wizard (depending on availability): Grease (1), Obscuring Mist (1),
Ray of Enfeeblement (1), Fog Cloud (2), Web (2), Touch of Idiocy (2), Tasha's Hideous Laughter (2),
Dispel Magic (3)/Shatter(2) combo, Darkness (2), Blur (2),
Hypnotic Pattern (2), Blindness/Deafness (2) ... tough due to Fort neg but awesome if it works, Pyrotechnics (2) - will save blindness but only lasts a few rounds, Deep Slumber (3), Sleet Storm (3), Hold Person (3), Suggestion (3), Displacement (3),
Ray of Exhaustion (3), Slow (3),
Evard's Black Tentacles (4),
Otiluke's Resilient Sphere (4),
Confusion (4),
Wall of Ice (4), Rainbow Pattern (4),
Bestow Curse (4), Fear (4)