Lumeris,  or the Blade of Time in the common tongue, is an elven-made glaive shaped like a large ornate grandfather clock's minute hand, decorated with everturning gears and imbued with the magic of Mechanus.        
It was forged and wielded by a legendary knight from the elven dominion of Artangor, south of the Wyrmstooth Peaks and behind the Mithril Gate - by most elves considered the epicenter of the art of blacksmithing. Said knight, originally a  watchmaker and blacksmith working for the dominion's royal house, was a devout follower of Primus and, due to his efforts in upholding law and order eventually rose to become one of the cloockwork deity's most influential servants.       
His duties soon required him to battle some more powerful, extraplanar entities of chaos -  and so, in preparation to his biggest and most dangerous quest, he kindled his forge for a final time before passing it down to his son and crafted Lumeris, a true masterpiece of elven craftsmanship and a weapon that should stand as a symbol for balance, order and for Mechanus itself.

Sentience. Lumeris is a sentiend, lawful neutral weapon with an Intelligence of 16, a Wisdom of 16, and a Charisma of 16. It has hearing and darkvision out to a range of 120 feet. The weapon communicates by transmitting emotions, sending a tingling sensation through the wielder's hand when it wants to communicate something it has sensed. It can communicate more explicitly, through visions or dreams, when the wielder is either in a trance or asleep.

Personality. Lumeris seeks to bring law, order and balance. It considers its wielder, just like everyone else, as a gear within a clockwork, and only if all these gears work in perfect balance and order, the clockwork itself, the world, functions as intended -  and therefore it wants to fix or get rid of faulty "gears". However, just like a modron being unable to disobey a higher-ranked modron's command, Lumeris is unable to disobey its wielder's command as it views its wielder as being higher-ranked within the absolute hierarchy of Mechanus.

Dormant. The glaive grants you the following properties while in its dormant state:

• You gain a +1 bonus to attack rolls made with this magic weapon. Attacks made with this weapon always deal average damage.
• When you hit with an attack with Lumeris, the attack deals an additional 5 force damage.
• As long as you are holding the glaive, you always know the exact time of the day.
• Beacon of Order. The weapon emits dim light out to a radius of 20 feet. This light always has exactly the same brightness, just enough to be exactly in balance between bright light and total darkness. Creatures within that aura always receive the average amount of hit points when healed.
• Slow Time: When you hit a creature with an attack using this weapon, you can force it to make a DC 15 Wisdom saving throw or be under the effect of a slow spell until the end of its next turn. You can use this ability a number of times equal to your proficiency bonus and regain all uses when you finish a long rest. 

Awakened. The glaive grants the following properties while in its awakened state:

• You gain a +2 bonus to attack rolls made with this magic weapon.
• The additional force damage increases to 10.
• The save DC for the glaive's Slow Time increases to 18.
• Clockwork Protection: Spectral clockwork gears manifest around you, which shield you from harm. Any critical hit against you counts as a normal hit instead and any time you take bludgeoning, piercing or slashing damage, you can reduce that damage by 5.
• Clockwork Magic: While you are holding the glaive, you can cast one of the following spells (saving throw DC 18) either as an action or, when you take the attack action on your turn, in place of one of your attacks: blink, dispel magic, freedom of movement, haste or vortex warp.

Exalted. The glaive grants the following properties while in its awakened state:

• You gain a +3 bonus to attack rolls made with this magic weapon.
• The additional force damage increases to 15.
• The save DC for the glaive's Slow Time and Clockwork Magic increases to 21.
• Absolute Balance: You are immune to any spell or effect that would alter your form or send you to a different plane of existence.  In addition, when you make an attack with this weapon, the roll can no longer be affected by advantage nor disadvantage and when you roll 9 or less on the d20 for an attack roll with this weapon, you can treat the roll as a 10 instead.
• Greater Clockwork Magic. While you are holding the glaive, you can cast one of the following spells (saving throw DC 21) either as an action or, when you take the attack action on your turn, in place of one of your attacks: blade barrier, steel wind strike or time stop.

Random Properties. Lumeris in its dormant state has one minor beneficial property and one minor detrimental property. When the glaive attains an awakened state, it gains an additional minor beneficial property and an additional minor detrimental property. When the glaive raches its exalted state, it gains a major beneficial property.

Destroying the Glaive. The glaive can only be destroyed once the gears of the great clockwork of Mechanus have reached the exact same position they were in when the glaive was forged. Only then it can be melted down in the forge of Artangor, where it was crafted. It needs to remain there for exactly a year, not longer and not shorter, and the temperature needs to remain constant for the entire time - then it will succumb to the flames.

Proficiency with a Longsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Bonus: Magic, elf of lawful neutral alignment, Damage, Combat, Warding, Versatile, Sap