Klaus
First Post
Try an Earth elemental instead. I cant be stuffed doing the maths but its an extra 252 HP per Short rest for the Druid. Also note, at 18th level, the Druid can cast spells in this form. Including 9th level spells. Like Foresight (8 hours no concentration required).
I believe you mean 126 hp, since an elemental form eats up two uses of Wild Shape. And the druid can't cast Foresight while wild shaped (can't provide material components, which Foresight does have, along with a one minute casting time). Of the 9th-level spells, the only one he can cast is Storm of Vengeance, which would also hit the druid. He could cast and maintain a 9th-level Call Lightning (9d10 lightning damage once per round), provided he doesn't lose concentration, and target a spot that hits the fighter but not himself. Of course, then he's not using his form's attacks.
In 2 levels time its an extra 252 hit points every single round (126 hit points per round from attacks against magic weapons) for the druid. Even Action Surging, and totally disregarding spells, the Fighter simply cant win a fight with this Druid (barring catching him asleep).
At 18th level, a druid is better off casting Shapechange (since Max CR equals his level) to turn into something like an Adult Gold Dragon. But that's beside the Wild Shape point. And at that level, a Champion Fighter (for instance) is regenerating 10 hp per round.
Case in point: can a Circle of the Moon Druid defeat a Fighter? Yes, he can. Is it a sure thing? No, it could go either way.