An idea I've had for a while now is a new class of weapons for the game, and they'd be 2-handed weapons. These would remove the use of a shield, take up 2 inventory loadout slots, and have multiple combos that could be used. They would also have a variety of charge attacks that would change depending on the weapon in question, and the combos would change as well.
Great-axes would be the fastest, they'd have the shortest range of the heavies (around the range of one of the 10 hit swords), would have lower base damage, but compensate by taking advantage of the enemy weaknesses through boosted critical damage. The basic charge attack would be similar to Garen's spin from LoL, whirlwind from Diablo 3, etc, but it would have the range of a troika swing.

The great-swords would be the middle-ground of the pack. They would have range equivalent to a 5 star brandish, and would have the widest variety of combos. Charge attack would temporarily buff the sword with their elemental alignment. The normal buff would be a flat damage boost. The charges are as follows:
*Shadow= Black hole effect, before bringing down a HEAVY slash. Highest damage
*Electric= Thunderstorm is called down, striking all enemies for moderate damage. Guaranteed shock proc. 3rd highest damage
*Poison= Constantly poison enemies with a noxious cloud, after stabbing sword into the ground. Lowest damage, due to the effects of poison.
*Fire = Stabs the sword into the ground, and unleash a screen-wide firestorm. 2nd highest damage damage
*Ice = Stab the sword into the ground, and freeze all enemies in a wide radius. Middle ground in damage
*Piercing = Barrage of stabs. Type depends on the elemental affect.

Finally, the Sledgehammers. These would be the slowest of the bunch, but would all have a chance to stun, due to the blunt trauma from the hammer itself. Each hit would carry a 50% chance to stun, and it would have the lowest mix-and-match possibility for combos. The charge attacks for this weapon class would equate to slamming the hammer into the ground, and creating a fissure. Piercing is an exception to the rules of stun and fissure. In the case of stun, it is replaced with a DOT proc.
*Normal= Basically, the Reinhardt ulti from overwatch. 2nd highest damage
*Fire= Lava erupting from the cracks, dishing out constant fire damage. 3rd highest damage.
*Poison= Release a variety of toxic chemicals, poisoning all enemies within the fissure. 2nd lowest flat damage, due to canceling enemy healing and reducing their defensive stats.
*Electricity= Call down a series of thunder strikes out in a cone formation. Middle ground in terms of damage.
*Shadow= Create a fissure that lets loose a dark monster, pulling enemies into the fissure, before exploding. Heaviest damage output.
*Piercing= Call spikes up from the ground. Immobilizes all enemies caught, but deals the lowest damage of the charges.

Now then, if anybody has ideas for LINES of 2-handed weapons (such as names, materials, appearance, etc.), go ahead and mention them. If I find any cool ones, they'll be added to this starting post.