Grumblemon is a fictional character and Digimon from the anime Digimon Frontier. He is referred to as "Grottemon" in Chuang Yi's translation of the Digimon Frontier manhua.

The name "Grumblemon" refers only to the Human Hybrid form of this Digimon. Throughout the series, Grumblemon gains the ability to spirit evolve into a number of other forms, each with a different name and special attack. The Human Hybrid, however, is his preferred form and the one he spends most of his time in. It is also the name he is most commonly referred to.

Grumblemon is one of the successors to the Ten Legendary Warriors and is the Warrior of Earth, the one who wields the Spirits of Earth left behind by AncientVolcanomon. He is subverted by the fallen Cherubimon of the Celestial Digimon and fights to the detriment of the Digital World now. He has a strong affinity with the earth, allowing him to summon Golemon from the ground, and wields the "Grotte Hammer" weapon.


H Spirit of Earth b

H Spirit of Earth

Grumblemon initially seems to be a simple being, but his slow drawl and lack of grammar hide a sharp and crafty mind capable of tricks and traps. He is confident in his abilities and has the strength to back them up, but once wronged, he becomes obsessed with making things even.


  • Seismic Sledge (Snake Eye Break): Smashes his "Grotte Hammer" into foes.
  • Jack in the Box


Grumblemon is one of Cherubimon's Legendary Warriors alongside Arbormon, Ranamon, Mercurymon, and Duskmon, and he does his best to collect data for his master. He begins the series with possession of the B Spirit of Earth, allowing him access to his stronger but less mobile Gigasmon form.

He targets the KaratsukiNumemon Mountain for its fractal code but is unable to determine where the key is. He threatens the local KaratsukiNumemon population, but because they don't know where it is, he kidnaps the females. When he returns, Grumblemon finds that the KaratsukiNumemon are threatening Ophanimon's DigiDestined, but he couldn't care less about them. He makes short work of them due to his ability to slide evolve into Gigasmon. Grumblemon manages to scan the mountain, scattering the DigiDestined. A Molehill Out Of A Mountain

Grumblemon then targets the Gotsumon Village, only to be thwarted just barely by Koji Minamoto as Lobomon. When he goes for a second attempt, he fights the other DigiDestined. During this battle, he manages to steal the H Spirit of Wind, leaving Zoe Orimoto helpless. He attempts to steal the B Spirit of Light unlocked by Gotsumon, but he is again thwarted by Koji, this time as KendoGarurumon, and he is dealt his first loss. Can't Keep a Grumblemon Down Angered by this defeat, he summons a Golemon from the earth to do his bidding. He ambushes the DigiDestined at the Fortuneteller Village, managing to cast a spell which prevents Koji, the only other owner of a Beast Spirit, from fighting. Grumblemon manages to take the H Spirit of Ice during battle. He is interrupted by BurningGreymon bursting out of the temple, defeating his Golemon and driving him off. A Hunka Hunka BurningGreymon He returns after trapping most of the DigiDestined in the forest. Grumblemon taunts Takuya with his inability to control his Beast Spirit, knowing that he went out of control as BurningGreymon. Despite both his mental attacks and taking Tommy hostage, Grumblemon is unable to best BurningGreymon and has both the H Spirit of Ice and B Spirit of Earth taken from him before he is forced to flee. Fear and Loathing in Los Arboles

Extremely angered, Grumblemon joins his fellow Warriors in tracking the DigiDestined to the Forest Kingdom where they ambush them and Sorcermon after they revive Seraphimon. Seraphimon handily takes care of the Warriors but falls when Mercurymon redirects his own attack at him. Seraphimon's data is taken, but Zoe manages to save the Digi-Egg. The DigiDestined escape through a hidden exit, and the fallen Warriors are stalled by Sorcermon's sacrifice from taking chase immediately. Better An Egg Than An Egg Shell Grumblemon, along with Arbormon, tracks the DigiDestined to the Blue Cave. He summons a whole horde of Golemon to aid him, and while Arbormon holds of Agunimon and Lobomon, he severely injures Tommy and J.P. Unfortunately for him, as he moves to finish off J.P., Whamon intervenes in the battle and inadvertently brings the B Spirit of Thunder into play, which J.P. uses to evolve into MetalKabuterimon. With his newfound power, J.P. quickly defeats Grumblemon, who is scanned for good as his purified Digi-Egg flies away. No Whamon

Later, when the Royal Knights attack the Village of Beginnings, a purified Grumblemon's Digi-Egg briefly takes on Grumblemon's astral form and attempts to protect the children of the future. For the first time in a long while, the ten Warriors stand together and work to drive off the Royal Knights, though the Village is lost. The purified Warriors acknowledge those who defeated them, and Grumblemon's Digi-Egg returns to the batch being saved by the Trailmon, atoning for their past. Glean Eggs And Scram

Other Forms[]

Grumblemon's Digi-Egg[]

Grumblemon's Digi-Egg

After being purified, Grumblemon's Digi-Egg briefly appears to try to protect the Village of Beginnings from the Royal Knights. Glean Eggs And Scram


B Spirit of Earth b

B Spirit of Earth

Gigasmon is Grumblemon's Beast form, which he undertakes when he slide evolves using the B Spirit of Earth. He is Grumblemon's raw power form.

Gigasmon is Grumblemon's de facto battle form, where he uses his raw strength to deal immense damage. He has completely mastered this form, and his first uses involves him utterly wiping the floor of the DigiDestined. A Molehill Out Of A Mountain It takes the B Spirit of Light and KendoGarurumon to hand him anything resembling to a defeat, although the fight seemed to be even and was drawn to an early close due to the collapse of the cliff edge they were fighting in. His control over his Beast form is a marked contrast compared to the others, who fall prey to the Beast form's feral instincts. Can't Keep a Grumblemon Down

Gigasmon is extremely dangerous, managing to steal not only the H Spirit of Wind Can't Keep a Grumblemon Down but also the H Spirit of Ice. A Hunka Hunka BurningGreymon He is handed a crushing defeat when BurningGreymon once Takuya Kanbara gains full control over the form, and Grumblemon loses the B Spirit of Earth to Takuya at this point, preventing him from assuming this form again. Fear and Loathing in Los Arboles


  • Quagmire Twister (Hurricane Bomber): Spins around, arms outstretched, like a tornado.
  • Tectonic Slam (Earthquake): Leaps above the ground and makes a ground-shaking landing.


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