Scion Martial Archetype 
A Fighter Subclass

Overview:

The Scion Martial Archetype seeks to allow players the ability to play the archetype of the wielder of an extremely powerful magical weapon, who is on a journey to master it. This was hard to do in the game before, as 5e encourages you to change weapons as you find more powerful loot along your adventures. This subclass makes it so that your weapon, called a mythic arm, evolves along with its wielder, unlocking more of the arm’s power. It brings new ways to build on the versatility inherent in the fighter class by allowing you to customize the mythic arm in order to make it feel unique. The mythic arm gains an additional damage type of your choice, as well as the ability to literally change its properties to unlock completely new combos.

The Scion Martial Archetype also seeks to give fighters more prompts while in character creation, to bring additional flavor to the class through the choice of subclass. How did your Scion come upon their mythic arm? Is it a weapon passed down from generation to generation of their family, or did they steal it from one of these families? Did they find the mythic arm somewhere, and have to figure out the weapon’s history?

3rd Level: Mythic Arm

When you choose this archetype at 3rd level, you wield a mythic arm, an extremely powerful weapon brimming with boundless potential for you to unlock. How you acquired this mythic arm is up to you, but it must be a weapon you are proficient with.

When you reach 3rd level, choose one of the following damage types: acid, cold, fire, lightning, necrotic, poison, radiant, or thunder. All mythic arm attacks made with the additional action granted by your action surge deal 1d8 of your chosen damage along with your weapon damage.

3rd Level: Wielding Legend

At 3rd level, the powerful magic that makes your weapon a mythic arm binds it to you and protects it from tampering. Your mythic arm counts as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage, cannot rust, be dulled, or break, and you cannot be disarmed while wielding your mythic arm as long as you’re not incapacitated.

You can also sense the direction of the mythic arm’s location and in which plane of existence it’s located. If the arm is moving, you know the direction of its movement.

Additionally, your mythic arm can absorb the enchantment and the shape of another weapon. When you acquire an enchanted weapon, you can spend one hour to transfer the enchantment from the enchanted weapon into your mythic arm. For example, if you wield a longsword as your mythic arm and acquire a +1 handaxe that has advantage on all attack rolls against beasts, you can take one hour to transfer that enchantment to your mythic arm, after which it will be a +1 longsword that has advantage on all attack rolls against beasts.

You are also able to change your mythic arm into the shape of any weapon it has absorbed an enchantment from by spending one hour concentrating on it. For example, after absorbing the enchantment from the +1 handaxe of the previous example, you can now turn your mythic arm into a handaxe by spending one hour concentrating on the mythic arm.

If you do not meet the prerequisites to attune to the weapon, you cannot transfer its enchantment into your mythic arm.

Once you have transferred an enchantment into the mythic arm, the original weapon loses its enchantment.

7th Level: Wondrous Wielder

At 7th level, you gain further control of your mythic arm, and you can manipulate the way you wield it in battle to transcend the limits of normal weapons. At the end of a long rest, you can select one of the following weapon properties to apply to your mythic arm: finesse, light, reach, or thrown (range 20/60).

10th Level: Unlocked Potential

At 10th level, the bond between you and your mythic arm allows you to draw even more power from your weapon:

• The additional damage you deal when making an attack with your mythic arm with the additional action granted by your action surge increases to 2d8. At 18th level, it becomes 3d8.
• You choose an additional damage type for your Mythic Arm feature. When you use an action surge, you choose which of the available damage types your additional attacks will deal. At 18th level, you can choose one additional damage type.
• You can absorb an additional enchantment into your mythic arm. At 18th level, you gain the option to absorb yet another additional enchantment, to a total of 3.

15th Level: Unleash Potential

At 15th level, you gain further control of your mythic arm, allowing you to unlock some of its hidden potential without exerting yourself in the process. On a successful attack, you can deal the additional damage you would deal with your action surge attacks. You can use this feature only once per turn.

18th Level: Mythic Scion

At 18th level, your mythic arm has become an extension of yourself, unlocking its full potential. Whenever you make an attack roll after you use your action surge, you treat all rolls of 9 or lower as a 10, and those attack rolls cannot be made at disadvantage.

Additionally, when you roll for initiative and have no uses of action surge remaining, you regain 1 use.

License

OPEN GAME License Version 1.0a The following text is the property of Wizards of the Coast, LLC. and is Copyright 2000 Wizards of the Coast, Inc (“Wizards”). All Rights Reserved.

1. Definitions: (a)”Contributors” means the copyright and/or trademark owners who have contributed Open Game Content; (b)”Derivative Material” means copyrighted material including derivative works and translations (including into other computer languages), potation, modification, correction, addition, extension, upgrade, improvement, compilation, abridgment or other form in which an existing work may be recast, transformed or adapted; (c) “Distribute” means to reproduce, License, rent, lease, sell, broadcast, publicly display, transmit or otherwise distribute; (d)”Open Game Content” means the game mechanic and includes the methods, procedures, processes and routines to the extent such content does not embody the Product Identity and is an enhancement over the prior art and any additional content clearly identified as Open Game Content by the Contributor, and means any work covered by this License, including translations and derivative works under copyright law, but specifically excludes Product Identity. (e) “Product Identity” means product and product line names, logos and identifying marks including trade dress; artifacts; creatures characters; stories, storylines, plots, thematic elements, dialogue, incidents, language, artwork, symbols, designs, depictions, likenesses, formats, poses, concepts, themes and graphic, photographic and other visual or audio representations; names and descriptions of characters, Spells, enchantments, personalities, teams, personas, likenesses and Special abilities; places, locations, environments, creatures, Equipment, magical or supernatural Abilities or Effects, logos, symbols, or graphic designs; and any other trademark or registered trademark clearly identified as Product identity by the owner of the Product Identity, and which specifically excludes the OPEN Game Content; (f) “Trademark” means the logos, names, mark, sign, motto, designs that are used by a Contributor to Identify itself or its products or the associated products contributed to the Open Game License by the Contributor (g) “Use”, “Used” or “Using” means to use, Distribute, copy, edit, format, modify, translate and otherwise create Derivative Material of Open Game Content. (h) “You” or “Your” means the licensee in terms of this agreement.

2. The License: This License applies to any Open Game Content that contains a notice indicating that the Open Game Content may only be Used under and in terms of this License. You must affix such a notice to any Open Game Content that you Use. No terms may be added to or subtracted from this License except as described by the License itself. No other terms or Conditions may be applied to any Open Game Content distributed using this License.

3. Offer and Acceptance: By Using the Open Game Content You indicate Your acceptance of the terms of this License.

4. Grant and Consideration: In consideration for agreeing to use this License, the Contributors grant You a perpetual, worldwide, royalty-free, nonexclusive License with the exact terms of this License to Use, the Open Game Content.

5. Representation of Authority to Contribute: If You are contributing original material as Open Game Content, You represent that Your Contributions are Your original Creation and/or You have sufficient rights to grant the rights conveyed by this License.

6. Notice of License Copyright: You must update the COPYRIGHT NOTICE portion of this License to include the exact text of the COPYRIGHT NOTICE of any Open Game Content You are copying, modifying or distributing, and You must add the title, the copyright date, and the copyright holder’s name to the COPYRIGHT NOTICE of any original Open Game Content you Distribute.

7. Use of Product Identity: You agree not to Use any Product Identity, including as an indication as to compatibility, except as expressly licensed in another, independent Agreement with the owner of each element of that Product Identity. You agree not to indicate compatibility or co-adaptability with any Trademark or Registered Trademark in conjunction with a work containing Open Game Content except as expressly licensed in another, independent Agreement with the owner of such Trademark or Registered Trademark. The use of any Product Identity in Open Game Content does not constitute a Challenge to the ownership of that Product Identity. The owner of any Product Identity used in Open Game Content shall retain all rights, title and interest in and to that Product Identity.

8. Identification: If you distribute Open Game Content You must clearly indicate which portions of the work that you are distributing are Open Game Content.

9. Updating the License: Wizards or its designated Agents may publish updated versions of this License. You may use any authorized version of this License to copy, modify and distribute any Open Game Content originally distributed under any version of this License.

10. Copy of this License: You MUST include a copy of this License with every copy of the Open Game Content You Distribute.

11. Use of Contributor Credits: You may not market or advertise the Open Game Content using the name of any Contributor unless You have written permission from the Contributor to do so.

12. Inability to Comply: If it is impossible for You to comply with any of the terms of this License with respect to some or all of the Open Game Content due to statute, judicial order, or governmental regulation then You may not Use any Open Game Material so affected.

13. Termination: This License will terminate automatically if You fail to comply with all terms herein and fail to cure such breach within 30 days of becoming aware of the breach. All sublicenses shall survive the termination of this License.

14. Reformation: If any provision of this License is held to be unenforceable, such provision shall be reformed only to the extent necessary to make it enforceable.

15. COPYRIGHT NOTICE Open Game License v 1.0a Copyright 2000, Wizards of the Coast, LLC. System Reference Document 5.1 Copyright 2016, Wizards of the Coast, LLC.; Authors Mike Mearls, Jeremy Crawford, Chris Perkins, Rodney Thompson, Peter Lee, James Wyatt, Robert J. Schwalb, Bruce R. Cordell, Chris Sims, and Steve Townshend, based on original material by E. Gary Gygax and Dave Arneson.

Pointy Hat Content, Copyright 2022, Antonio Demico.

PRODUCT IDENTITY
The following items are designated Product Identity, as defined in Section 1(e) of the Open Gaming License Version 1.0a and are subject to the conditions set forth in Section 7 of the Open Gaming License, and are not Open Content:

All trademarks, registered trademarks, propernames, dialogue, plots, storylines, locations, characters, artworks, and trade dress. (Elements that have previously been designated as Open Game Content are not included in this declaration.)

OPEN GAMING CONTENT

All content from the System Reference Document 5.1 is Open Game Content as described in Section 1(d) of the License. No portion of this work other than the material designated as Open Game Content may be reproduced in any form without permission.