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Moonblade 5e dnd spell and expected damage with N Runes

Moonblade 5e dnd

moonblade 5e in dnd has one rune on its blade for every master it  served (typically 1d6 + 1). The initial rune always grants a +1 bonus to attack and damage rolls made with this magic weapon. DMG: p217, 3 lb. 1d8 slashing – flexible (1d10)

Of all of the magic items created by the elves, one of the most prized and jealously guarded is a moon blade. In early times, almost all elven noble homes claimed one such blade. Over the centuries, some blades have faded from the Earth. Their magical loss as family lines has become extinct. Other blades have disappeared with their bearers during good quests. Thus, just a few of those weapons remain.

5e moonblade passes down from parent to child. The sword selects its bearer and stays bonded to that individual for life. If the bearer expires, the other heir can maintain the blade. If no worthy heir is present, the sword lies dormant. It functions like a standard longsword until a worthy soul finds it lays claim to its power.

Properties of Moonblade 5e

  • A moonblade serves only one master at one time. The attunement process requires a special ritual in the throne room of an elven regent or within a temple devoted to the elven gods.
  • A moonblade won’t serve anyone. It appears as craven, inconsistent, tainted, or at odds with preserving and protecting elvenkind. If the blade rejects you, you create ability checks, attack rolls, and saving throws with drawback for 24 hours. You remain attuned to the weapon until you die or the weapon is destroyed.
  • A moonblade has one rune on its blade for every master it’s functioned (typically 1d6 + 1). The first rune always grants a +1 bonus to attack and damage rolls made for this magical weapon—each rune beyond the initial grants the moon blade an additional property. The DM chooses each property or decides it randomly on the 5e Moon Blade Properties table.

Moon blade 5e Property table

d100 Property
Jan-40 Raise the bonus to attack and all damage rolls by 1, to a max of +3. You can reroll if the moonblade already has a +3 bonus.
41-80 The moonblade wins a randomly determined minor property.
81-82 It gains the finesse property.
83-84 Dnd 5e moonblade gets the thrown property with a range of 20/60 ft.
85-86 The moonblade works as a defender.
87-90 The moonblade 5e will score a critical hit on a roll of 20 or 19.
91-92 Suppose you hit with an attack using the moonblade. In that case, the attack deals with an extra 1d6 slashing damage.
93-94 Suppose you hit a monster of a particular type like a dragon, fiend, or undead with the 5e moonblade. So, the target will take an extra 1d6 damage of one of the following types: acid, cold, fire, lightning, or thunder.
95-96 You may use a bonus action for the moonblade to flash brightly. Suppose there are creatures that can see you and is within 30 ft of you. Then it  needs to succeed on a DC 15 Constitution saving throw or else become blinded for one minute. A creature may repeat the saving throw at the finish of each of its turns. That must end the effect on itself on a success. That property is no more useful again until you take a short rest while attuned to a weapon.
97-98 The moonblade works as a ring of spell storing.
99 You may use an action to call forth an elfshadow. It works when  you don’t already have one serving you. Dnd elfshadow appears in an empty space within 120 ft of you. It utilizes the statistics of a shadow, except it has neutral property, immune to consequences that turn undead. Also it doesn’t create any new shadow. You control the creature, determining how it moves and acts. It stays until it drops to 0 hit points or you cancel it as an action.
0 Dnd 5e moonblade functions as a vorpal sword.



Sentience. A moon blade is a sentient neutral fantastic weapon with an Intelligence of 12, a warrior of 10, and a Charisma of 12. It has heard and darkvision out to a range of 120 feet.

It can communicate more explicitly, through visions or dreams, when the wielder is either in a trance or asleep.

Personality. Each moonblade seeks the progress of elvenkind and elven ideals. Courage, loyalty, beauty, music, and life are all a part of the purpose.

The weapon is bonded to the household line it’s meant to serve. When it has connected with an owner who shares its ideals, its devotion is absolute.

In case a moon blade has a flaw, it’s overconfidence. Once it’s decided in an owner, it considers that only that person should wield that, even if the owner falls short of elven ideals.

Versatile. This weapon can be helpful with one or two hands. A harm worth in parentheses appears with the property–the damage once the weapon is used with two hands to produce a melee attack.

Expected damage of a moonblade with N runes?

Some runes have limits on how many times you get them. Suppose the moonblade has gained these runes. It cannot acquire them again. The odds of achieving the remaining runes—including the quoted damage-improving runes—improves in the future.

Let us assume that each rune is determined randomly per the table. Rerolling any rolls will result in a rune that would not stack with the runes already on the moonblade. And that the creature-type-specific runes are distributed evenly among the creature types (feel free to assume fractional runes for that purpose). What is the expected value of the damage roll of a moonblade with n runes?

Please consider that the hit has already taken place. Hence, changes to the weapon’s accuracy, such as making it finessed. Or it will be making it simpler to target enemies in the first place, such as making it thrown, are irrelevant. Also, absent any information about the target, ignore the damage benefit that vorpal might have. It may include the chance of a critical hit, including the likelihood that the relevant rune has doubled the critical threat range.


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