A lot of talk has been put into giving bombs a standard attack.... lets turn the tables with charge only guns and swords. Here are just a few ideas I have had.
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Gun: Branches from 3 star Blaster (normal)
Phantom's howl 4*: Normal damage
v
Banshee's scream 5*: Normal damage
or
Fiend's screech 5*: Shadow sidegrade
This gun line has no regular attack
Charge attack: A blaster charge like bullet is fired and penetrates foes for moderate damage, no knockback is done. Every foe hit gives off a shockwave that deals damage to surrounding enemies. (Note: Shockwave does not lead to other shockwave)
The damage for all of this would be quite low against individual targets, this weapon would shine when combined with vortex bombs where it can hit multiple foes and sent out multiple waves that spread damage. The starting AOE of the shockwave would be quite small but would eventually reach the size of a 2 star mist bomb. http://wiki.spiralknights.com/File:Toxic_Vaporizer_blast_radius.png
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Sword: Branches from 3 star Calibur
Based on attack patterns of:
Rook: http://www.regencychess.co.uk/blog/wp-content/uploads/2012/05/how-rook-m...
King: http://www.activityvillage.co.uk/sites/default/files/images/king-moves.jpg
Queen: http://www.chessvariants.org/d.chess/queenmov.gif
Rook's Heart 4*: Normal
Charge attack releases a 2 hits spin and 4 nearby explosions, much like a short range brandish attack. 2 explosions in each direction.
v
King's Soul 5*: Normal/Shadow
Charge attack releases a 3 hit spin and 8 nearby explosions that deal high damage. The explosions of this bomb would go off after the spin (which would flinch but not cause knockback), these bursts would be the same size as the proto bomb blast. These Blasts would cause strong knockback like an Irontech.
Queen's Wrath 5*: Normal/Elemental
Charge attacks releases a one hit spin and a chain of 3 explosions in 8 different directions. The explosions for this would be slightly lower than a 1/3 of the King's Soul explosion due to the extra range. These explosions would also be smaller; about the size of the brandish explosions.
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Concern for balance: These weapons have much higher charge attack damage than other similar guns/swords, this is to offset the lack of a standard attack. If attack is spammed it will result in a similar situation to clickspamming with a bomb.... you just end up rapidly transitioning from charge stance to neutral stance.
Uses: These are meant to be powerful and wisely used spike damage attacks. Since you are vulnerable while charging a fair amount of skill is needed which is why these lines branch off at 4*
Raw power estimation: The cumulative raw power of these weapons I estimate to be in the range of;
For guns: Similar to Magnus charges plus their neutral combo meaning that for the ones listed the shockwave+bullet > one single magnus charge hit but not my much.
For swords: Raw total damage against crowds would be greater than an Acheron or Nightblade but due to the spread of the attack it would be less useful against single or small groups.
Updated OP