Body Horror: After Gumbald modifies his body and turns him into the Green Knight, his body becomes a darker shade of green, grows thorns on his limbs and head, becomes much larger and his head has holes scattered around his face.

Audible Sharpness: Rings like a bell when swung.

Ascend to a Higher Plane of Existence: Is reborn as a gigantic tree that watches over Ooo, with the Finn sword in its branches for a future hero to find.

After 'Three Buckets,' this trope is averted for Fern as he has now become Gumbald's willing minion, before pulling a Heel-Face Turn upon sorting things out with Finn, although the curse itself remains ambiguous as it's motives are not addressed. By 'Whispers,' he's decided he wants to replace Finn, but his goals from there aren't addressed. Fern, on the other hand, is like Flame Princess in that, while violent, he's not completely evil.

Ambiguously Evil: Though it did at one early point attempt to overwhelm Finn, the majority of the time it seems to act in his interest even when acting without his permission.

Always Second Best: Fern's insecurities make him feel this way about Finn.

Alas, Poor Villain: Despite being a massive jerk on numerous occasions, he eventually dies sympathetically.Alternate Self: Fern is a hybrid of the Grass Sword and the version of Finn that became a sword via time paradox.Unfortunately, the force of the asteroid's departure was so great that it ripped Finn's arm off even then, the grass sword somehow made it so that the stump was completely healed over at the moment his arm was ripped off. Adaptive Ability: It reacts to Finn's intense desire to not let his father escape in 'Escape from the Citadel', taking over his whole arm, swelling up enormously, and giving him enough strength to restrain an asteroid from taking off.Absurdly Sharp Blade: Sharp enough to slice through metal, and incredibly precise.As of Season 7 episode 'Reboot', it detaches itself from Finn and merges with the Finn Sword, becoming its own person. It cannot be removed, but becomes controllable once Finn accepts it as his weapon. Voiced by: Hayden Ezzy (as Fern), Brad Neely (as the Green Knight)Ī cursed sword made of grass provided to Finn by the Grassy Wizard.

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