Monster Mounts would essentially be a game where knights ride atop various clockwork monsters into battle, and fight amongst themselves.

The game would be set up such that all players obtain a new starting weapon, and "jousting armor". Players can wear a costume over their jousting armor, as it is automatically assigned. Jousting armor would be set up so that players have vulnerabilities and resistances to the same damage types as their mount does. The new weapon would make the player deal the same damage as their mount would in the clockworks, and has various attack patterns that varies per mount.

The Mounts
There would be various kinds of mounts, some more obvious than others, and each with a range of abilities. Knights will have 3 different abilities while atop a mount, each triggered by the attack, defend, and dodge keys.

Beasts
Players can ride on alpha wolvers into combat. These wolvers are based on the tier 1 alpha wolvers. Weapon resembles a cutter.
Alpha Wolvers are fast. When players hit their dodge key, the wolver will swiftly dodge in that direction. Has a 3 second cooldown. After pressing their attack key, the wolver will lunge 3 times, and the player will slash forwards each lunge. When shielding players have a 25% chance for their mount to dodge to the left or right, negating damage to the knight.

Players can ride on chromalisks into battle. These lizards are based on the tier 3 chromalisks. Weapon resembles a magnus.
Chromalisks are not as fast as their wolver counterpart, but are not slow. When players hit their dodge key, the chromalisk will jump to the side, negating all damage to the knight during the jump. Has a 2 second cooldown. Pressing the attack key, the player will fire a single bullet and quickly reload. Pressing the shield key will cloak both the player and the chromalisk completely. Cloak cannot be reactivated for 5 seconds after leaving cloak.

Slimes
Players can ride on lichen colonies, and glorp their way onto the battlefield. These slime groups are based on the first transformation lichen colonies have, AKA the orange one. Weapon resembles a shard bomb.
Lichen colonies are slow. When players hit their dodge key, the colony will lurch forwards, pushing any mounts forwards (friendly or hostile), and also stuns the knight atop the mount (hostile only). Has a 7 second cooldown. Pressing the attack key will make the player plant a bomb into the slime, who in turn shoots out spikes in three directions (forwards, left, and right) after a short delay. Shielding will have your mount absorb 10% of incoming damage, and put your player to sleep, healing you. Releasing the shield button will have 2 seconds delay before your knight wakes up.

Players can jiggle into battle on jelly cubes! These treats are based on their tier 3 variant. Weapon resemble a calibur.
Jelly Cubes move at a mediore speed. Nothing too fast, nothing too slow. When players hit their dodge key, the jelly cube will spin around, knocking back any hostile mounts and stunning their rider. Has a 6 second cooldown. Pressing the attack key will make the jelly cube lurch forwards, and the player do a spinning attack that hits on all 360 degrees! Holding down the shield key makes players counter attack when hit, but they still take full damage.

Constructs
Players can ride a lumber onto the coliseum floor. These lumbers are based on the tier 2 lumbers. Weapon resembles a troika.
Lumbers are slow. So very slow. When players hit their dodge key, the lumber smacks the ground, knocking all mounts back and stunning their riders. Watch the friendly fire! Has a 6 second cooldown. Pressing the attack key will have the player swing their weapon down with heavy force, and can stun riders. Holding down the shield key will prevent players from being hurt from the front, however limits their turning movement, even 2 seconds after releasing the shield button.

Players can move about on a scuttlebot, and scurry into the fight! These scuttlebots are based on their tier 3 variant. Weapon resembles a sealed sword.
Scuttlebots aren't fast, but aren't too slow either. When players hit their dodge key, the scuttlebot will dodge to the side, negating all damage to the knight during the jump. Has a 2 second cooldown. Pressing the attack key will make the player swing their sword forwards. Holding down the shield key will make the knight kneel down on the scuttlebot, allowing for both faster movement (6% faster) and a 33% chance to dodge enemy attacks. Players are immobilized while kneeling and standing, and cannot attack for 1 second after switching between the two.

Gremlins
Gremlins didn't like the idea of knights riding them. If anything they wanted to ride on us. This didn't carry over very well. Luckily, they set us up with some specialized constructs for our "odd and wacky" game.

Players can ride on an outfitted gun puppy with integrated hover technology. These puppies are based on their tier 2 variant. Weapon resembles an autogun.
These gun puppies are quick, but have a hard time coming to a stop. Pressing the dodge key will make the gun puppy swerve to the left or the right, giving the rider a 50% chance to dodge attacks during this time. Has a 4 second cooldown. Pressing the attack key will have the player swing their autogun up and fire. If the player hits the attack button again before moving, they will release a charge attack. Holding down the shield key will make the player accelerate quicker if moving, or slow down quicker if not pressing a movement key, but will not allow the player to attack for 2 seconds after the shield key is let go.

Players may also ride a modified retroid into battle. This robot has a nice comfy platform built into its back for you to stand upon and a nifty shield built into its front, although it smells strangely of gremlin fur. Weapon resembles a pulsar.
Retroids move at a moderate pace. Pressing the dodge key will make the retroid release a short stun pulse around itself, stunning but not pushing back hostile mounts. Has a 5 second cooldown. Attacking will make the player release a charged pulsar shot, pushing back any hostile mount and damaging its rider. Shielding will make the mount immune to damage from the front and prevent movement until 2 seconds after the shield key is released. During the shielded time, the player can still attack, however there are 1 second delays between attacks.

Undead
Ride into battle upon a spooky spookat. This is based upon their tier 2 variant. Weapon resembles an alchemer.
Spookats move at a mediorce pace. Pressing the dodge key will make the kat lunge forwards several tiles, and face whatever mount is closest to the cursor. Has a 5 second cooldown. Pressing the attack button will make the player fire a single bullet forwards. Holding down the shield key will make the kat cast a protective aura around themselves, which lowers all incoming damage by 50% but also prevents the knight from attacking and dodging. The player cannot dodge for 8 seconds after the shield key is released, and cannot attack for 2 seconds after the shield key is released.

Players can ride atop a large grave scarab and hover into the fight. This is based upon the dark harvest scarabs mounts. Weapon resembles a flourish.
Scarabs move at a reasonable pace, but not too fast. Pressing the dodge key will make the scarab flap its wings to become airborn, then do a barrel roll to the side. Has a 4 second cooldown. Pressing the attack key will make your scarab become airborn, then fly forwards with your knight swiping back and forth at the air until it lands. During this attack, your knight is more vulnerable to incoming attacks. Holding down the shield key will make your player kneel down on their mount, allowing for faster movement and players take 20% less damage. Cannot attack or dodge for 2 seconds after releasing shield key.

Fiends
Ride upon a fiendish greaver and strike fear into your enemies! This is based upon the tier 2 greaver. Weapon resembles a spur.
Greavers move at a fast but not too fast pace. Pressing the dodge key will make the greaver lunge forwards for around 6 tiles, but not attack. Has a 6 second cooldown. Pressing the attack button will make the greaver swing in close to the mount closest to the the cursor, and after a 3 second wind-up the player swings once. Cannot use the dodge function or attack again for 2 seconds after attacking. Holding down the shield key will make the greaver move at half speed, but heal any nearby friendly mounts. If two mounts are being healed, then the greaver's rider will heal as well. Cannot use the dodge or attack for 3 seconds after releasing shield.

Players can also feel the brute power of a trojan as they storm into battle. This is based upon the tier 1 trojan. Weapon resembles a troika.
Trojans move at a very slow speed. Pressing the dodge key will make your trojan hold up its shield, and lunge forwards several tiles, knocking back any mount in its way. Has an 8 second cooldown. Pressing the attack key will make your player swing their sword down with an overhead smash, and can stun riders. Holding the shield key makes the mount immune to damage from the front, but prevents turning for 3 seconds after releasing the shield key. This mount also takes 20% less damage from the front, but a bonus 40% damage from the back! They also have a slower turning speed, so watch out for faster enemies!

Players have a set amount of health, however have a small chance (5-10%) to be knocked off their mount from any attack that is effective against them. That will instantly respawn the player. Mounts without a rider will play an animation and despawn.

Some of these mounts can be discarded, but I wanted to give an example of 2 enemies from each monster family (sans gremlins) that could be turned into a mount. Trojans, scuttlebots, and alpha wolvers are probably the three most needed mounts with chromalisks and greavers as close seconds.

TL;DR - make a minigame where we ride on top of monsters and smack each other with weapons, all predetermined by the game so we don't have imbalance between players.