Here are a couple ideas for weapon lines with dashes (or charges) similar to the Rocket Hammer's dash. Coincidentally, they're both based on monsters. One of them (the Lichen Lance line) is a serious suggestion, while the other (the Trojan Sword line) is here mostly because I think it would be awesome to have a Trojan's moveset.
EDIT: I changed a few things about the Lichen Lance line weapons in response to feedback received on them. I might edit the Trojan Sword line later, but I like every alteration to it that was suggested as of this edit.
EDIT 2: I finally got around to editing the Trojan Sword line. I split it into two possibilities, one inspired more by Fehzor's feedback and the other inspired more by Luguiru's.
Lichen Lance (3*)
Appearance: It looks like a lichen that has been stretched vertically.
Flavor Text: Most knights don't know why this weapon is called a lance, since it's not very lance-like. No one has ever bothered to call it anything else, though.
Weapon Type: Two-strike sword
Damage Type: Piercing
Status Effect: None
First Strike: A forward thrust with the lance. It has no horizontal range, but great vertical range.
Second Strike: A dashing forward thrust with the lance. This strike goes as far (or maybe farther) than the Rocket Hammer, but the knight never turns around during it.
Charge Attack: The knight sticks the lance into the ground, causing a shockwave around the knight.
Lichen Colancey (4*)
Appearance: It looks like a lichen colony that has been stretched vertically. It has lichen colony barbs on top.
Flavor Text: This spear is formed when a bunch of Lichen Lances are left in storage together. How this happens is unknown, since none of the Lichen Lances are alive.
Weapon Type: Two-strike sword
Damage Type: Piercing
Status Effect: None
First Strike: A forward thrust with the lance. It has no horizontal range, but great vertical range.
Second Strike: A dashing forward thrust with the lance. This strike goes as far (or maybe farther) than the Rocket Hammer, but the knight never turns around during it.
Charge Attack: The knight sticks the lance into the ground, causing thorns to come out of the ground around the knight. This is similar to a giant lichen colony's thorn roots attack, but with less range.
Giant Lichen Colancey (5*)
Appearance: It looks like a giant lichen colony that has been stretched vertically. It has giant lichen colony horns on top.
Flavor Text: It takes a lot of Lichen Lances to make this spear. The result is certainly worth it, however.
Weapon Type: Two-strike sword
Damage Type: Piercing
Status Effect: None
First Strike: A forward thrust with the lance. It has no horizontal range, but great vertical range.
Second Strike: A dashing forward thrust with the lance. This strike goes as far (or maybe farther) than the Rocket Hammer, but the knight never turns around during it.
Charge Attack: The knight sticks the lance into the ground, causing thorns to come out of the ground around the knight. This is similar to a giant lichen colony's thorn roots attack.
Toxilanco (5*)
Appearance: It looks like a toxilargo that has been stretched vertically. It has giant toxilargo horns on top.
Flavor Text: Like its living counterpart, the Toxilanco constantly spews poison gas. Knights that don't like the smell of whatever it is toxilargos smell like should wear a gas mask when wielding this weapon.
Weapon Type: Two-strike sword
Damage Type: Piercing
Status Effect: Poison
First Strike: A forward thrust with the lance. It has no horizontal range, but great vertical range.
Second Strike: A dashing forward thrust with the lance. This strike goes as far (or maybe farther) than the Rocket Hammer, but the knight never turns around during it.
Charge Attack: The knight sticks the lance into the ground, causing thorns to come out of the ground around the knight. This is similar to a toxilargo's thorn roots attack.
Oilancer Baron (5*)
Appearance: It looks like an oiler that has been stretched vertically. It has giant T3 oiler horns on top, and is on fire.
Flavor Text: Knights who hold this spear feel a burning sensation in their hand, as well as a burning desire to invest in drilling equipment. The former can be explained by the fact that they're holding something on fire.
Weapon Type: Two-strike sword
Damage Type: Piercing
Status Effect: Fire
First Strike: A forward thrust with the lance. It has no horizontal range, but great vertical range.
Second Strike: A dashing forward thrust with the lance. This strike goes as far (or maybe farther) than the Rocket Hammer, but the knight never turns around during it.
Charge Attack: The knight does a powerful forward thrust with the lance, going through any enemies (other than shielded or immune enemies) in his or her path. During the thrust, the knight drops a line of oil along the path of the thrust. Once the thrust is finished, the oil catches on fire and inflicts Fire on any enemy that touches it. The oil disappears soon after it catches on fire.
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The suggestions for the Trojan Sword line will be different. As all three swords in this line are exactly the same except for damage, flavor text, and color for each suggestion, I will have a single profile for each line.
Trojan Sword Line (Possibility One)
Names: Trojan Sword (3*), Dark Trojan Sword (4*), Trojan Knightmare Sword (5*)
Appearance: The Trojan Sword looks like a T1 trojan's sword, the Dark Trojan Sword looks like a T2 trojan's sword, and the Trojan Knightmare Sword looks like a T3 trojan's sword. All of them are smaller than actual trojan swords, being about the same size as a sword from the Troika line.
Weapon Type: Two-strike sword
Damage Type: Normal/Shadow
Status Effect: Stun (on second strike), Shock (on charge attack)
First Strike: A charge attack similar to the one trojans use. It has a slow startup and cannot be shield cancelled. The knight cannot change direction during the dash, and recovers slowly if he or she doesn't use the second strike afterward.
Second Strike: A sword slam similar to the ones trojans use. It has a fairly slow startup and slow recovery. It cannot be shield cancelled, but has a fair chance of causing moderate stun.
Charge Attack: An attack similar to the attack buff that trojans use. It deals great knockback and has a fair chance of causing moderate shock. It deals very little (if any) damage, however, and it doesn't increase the knight's attack power.
Player Stat Modifications: Movement speed decrease medium and attack speed decrease medium
Trojan Sword Line (Possibility Two)
Names: Trojan Sword (3*), Dark Trojan Sword (4*), Trojan Knightmare Sword (5*)
Appearance: The Trojan Sword looks like a T1 trojan's sword, the Dark Trojan Sword looks like a T2 trojan's sword, and the Trojan Knightmare Sword looks like a T3 trojan's sword. All of them are smaller than actual trojan swords, being about the same size as a sword from the Troika line.
Weapon Type: One-strike sword
Damage Type: Normal/Shadow
Status Effect: Stun (on normal attack)
Normal Attack: A sword slam similar to the ones trojans use. It has a fairly slow startup and slow recovery. It cannot be shield cancelled, but has a fair chance of causing moderate stun.
Charge Attack: A charge attack similar to the one trojans use. It has a slow startup and cannot be shield cancelled. The knight cannot change direction during the dash, and recovers slowly if he or she doesn't use the second strike afterward.
Player Stat Modifications: Movement speed decrease medium and attack speed decrease medium
Trojan Swords: Shield-cancel to win the game.
Lichen Lances: I don't know if they'd be able to restrict your turning before using your second strike. Also "Colancy" just doesn't look...correct to me. I feel like "Colancey" might be better, but it still seems weird.
Sorry for the shallow response, but I should be doing homework right now. >_>