★ We'd like to see a little more on King's abilities! Please be sure to define any canon-specific terms (for example, what would a power level of 4190 mean?), as well as flesh out Chastiefol's capabilities in your own words.
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In terms of power levels, the idea in Seven Deadly Sins acts just like the ones in Dragonball Z. When Merlin gives Hawk the ability to perceive power levels, she intends for it to be used as a way of gauging the levels of their enemies, the Ten Commandments of the demon race. For example, Meliodas is more powerful than King at 32,000 after their training with the druids even with King's added power level of 11k while wielding Chastiefol, but King is still more powerful than a Holy Knight or regular human. It just means that in terms of strength, he's stronger than the average fighter (even though he sucks without his weapons).
Chastiefol, the spirit spear and King's holy weapon, has nine total abilities, but is mostly found in pillow form when not in battle, used as King's mode of transportation as well as his sleeping spot. Its true form is a spear that's almost as long as King is tall, and he uses his levitation abilities in order to be able to move it around. One of the attacks he uses in its weapon form is Bumblebee, used when trying to provoke Ban's memory of him. It's just as it sounds, using it to rapidly attack an opponent and swarm them like an angry hive.
Guardian is the second form, and it takes the persona of a large bear, which King then uses to immobilize or fight his enemies. This isn't used very often and was introduced, like Bumblebee, in egging on Ban into fighting him. As Chastiefol's bear form is compromised of moss, it's very resistant to fire but not so much to the ice or cold.
Fossilization is the third form. King used this ability to petrify Ban in his introductory arc, only it was easily undone by Elaine's spirit when she kisses him. It's a near permanent state of fossilization as a result, though reversal affects are unknown aside from the one mentioned previously.
Sunflower is the fourth form. Using Chastiefol, King can summon a large flower that blooms over its enemies, bright as a sunflower and in the same shape as one. The resulting attack is capable of causing great disaster, which works considering one of his ability's names.
Increase is the fifth form, taking on the form of kunai style knives which he can control through hand movements and direction with his levitation skill. He can focus these to strike at a single opponent or at multiple, depending, and is a subsequent form counting as the sixth form of Chastiefol.
Luminosity is the seventh form, creating a sphere of light that can illuminate the darkness surrounding King and those with him. This is used when exploring the cavern that Hendrickson was keeping the body of the demon that attacked the Fairy King's Forest in, and again to light up the cavern where he trains with Meliodas in the land of the druids.
Pollen Garden is the eighth form, a barrier which withstands even the most brutal of attacks. King uses this to protect Diane (and by default Howzer) while fighting Helbram in the final battle against the enhanced Holy Knights. It doesn't, however, heal injuries.
True Spirit Spear Chastiefol is the ninth form, and takes a great deal of King's concentration and power, threatening to make him unconscious but almost doubles his strength/power level and his true destructive capabilities are shown during the fight with the Albion demon in the Forest, all but completely destroying it. This attack isn't used much, however, because of its aforementioned energy sucking.
Requested Revisions
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In terms of power levels, the idea in Seven Deadly Sins acts just like the ones in Dragonball Z. When Merlin gives Hawk the ability to perceive power levels, she intends for it to be used as a way of gauging the levels of their enemies, the Ten Commandments of the demon race. For example, Meliodas is more powerful than King at 32,000 after their training with the druids even with King's added power level of 11k while wielding Chastiefol, but King is still more powerful than a Holy Knight or regular human. It just means that in terms of strength, he's stronger than the average fighter (even though he sucks without his weapons).
Chastiefol, the spirit spear and King's holy weapon, has nine total abilities, but is mostly found in pillow form when not in battle, used as King's mode of transportation as well as his sleeping spot. Its true form is a spear that's almost as long as King is tall, and he uses his levitation abilities in order to be able to move it around. One of the attacks he uses in its weapon form is Bumblebee, used when trying to provoke Ban's memory of him. It's just as it sounds, using it to rapidly attack an opponent and swarm them like an angry hive.
Guardian is the second form, and it takes the persona of a large bear, which King then uses to immobilize or fight his enemies. This isn't used very often and was introduced, like Bumblebee, in egging on Ban into fighting him. As Chastiefol's bear form is compromised of moss, it's very resistant to fire but not so much to the ice or cold.
Fossilization is the third form. King used this ability to petrify Ban in his introductory arc, only it was easily undone by Elaine's spirit when she kisses him. It's a near permanent state of fossilization as a result, though reversal affects are unknown aside from the one mentioned previously.
Sunflower is the fourth form. Using Chastiefol, King can summon a large flower that blooms over its enemies, bright as a sunflower and in the same shape as one. The resulting attack is capable of causing great disaster, which works considering one of his ability's names.
Increase is the fifth form, taking on the form of kunai style knives which he can control through hand movements and direction with his levitation skill. He can focus these to strike at a single opponent or at multiple, depending, and is a subsequent form counting as the sixth form of Chastiefol.
Luminosity is the seventh form, creating a sphere of light that can illuminate the darkness surrounding King and those with him. This is used when exploring the cavern that Hendrickson was keeping the body of the demon that attacked the Fairy King's Forest in, and again to light up the cavern where he trains with Meliodas in the land of the druids.
Pollen Garden is the eighth form, a barrier which withstands even the most brutal of attacks. King uses this to protect Diane (and by default Howzer) while fighting Helbram in the final battle against the enhanced Holy Knights. It doesn't, however, heal injuries.
True Spirit Spear Chastiefol is the ninth form, and takes a great deal of King's concentration and power, threatening to make him unconscious but almost doubles his strength/power level and his true destructive capabilities are shown during the fight with the Albion demon in the Forest, all but completely destroying it. This attack isn't used much, however, because of its aforementioned energy sucking.