This is the RPG System: All-In-One, the only one you’re going to need, all features of a full RPG game in one Framework. 

Fully Customizable, easy to Integrate and Multiplayer ready!

Use one of the two pre-made examples (Top-Down | Third-Person) or implement it into your own Character, there is no restriction.

New Playable Demo (Major 3 Update): Link

Showcase: Link

Discord: Link

Documentation 2.0: Link

The developer describes the content as follows:

My asset is supposed to be a foundation, not a concrete block that cannot be changed

The Major Update 3 is now live! Check out the Patch notes here: Link

Changelog history: Link

Disclaimer: The shown Environment (MultistoryDungeon) in the pictures/videos is NOT included!

Features:

Major Update 3:

• Quest System - A highly customizable Sandbox-Like Quest System, keeps track of specific Variables (Custom Variables) and can trigger events/communicate with other objects without any Object References! (Custom Dispatcher)
• Personal Storage System - A Storage system to store all the trash goodies
• Party System - Party system to be able to quest together (Invite, Kick, Change Leader)
• Chat System - A must-have Chat System to chat with buddies (All, Party, Whisper)
• Custom Dispatcher/Variable System - Reference-less way to communicate between Objects, can be used to create any type of puzzles/quests/events
• and more Improvements!

Major Update 2:

• Shop System - Dynamic Shop System with a optional restock timer and the ability to rebuy sold Items
• Multiplayer Save System - New Save System which is now capable of storing the saves on the Server and accepting local save files from clients to be loaded
• Extended and Improved Drop System - Improved the algorithm and added the ability to create large loot pools, limit the tries of dropping an Item and how many Items can be dropped
• Skill System Improvement - Added a new feature to the Skill System that executes the AoE Damage dealing without stopping the game thread, it improves the performance a lot if a large amount of AI (30+) gets hit at once
• Item Amount Selector Widget - Split your stackable Items, Buy/Sell or drop only a portion of your stack
• and more AI Improvements!

Major Update 1:

• Companion System - Permanent AI that fights with you on your side, can levelup, wear Items, spendable stats and a Skill tree!
• Summoner/Minion System - Temporary AI with premade stats and skills that fight with you until they die. (Useful for Summoner/Necromancer classes)
• Pet System - Unlock Pets from Pet Cubes(droppable), they can have Stat bonuses and autoloot specific ItemTypes.
• and a lot of other changes! (Please check out the changelog)

Base:

• Multiplayer
• Class System - Dynamic Class System which provides Stat bonuses and Skills for each class. It supports multiple classes on one character
• Damage System - Melee, Ranged, Physical/Magical, Elements, Defense, Flee, Block, Hit rate, Critical Chance...
• Dynamic Class System - Multi-Class, Base Stats, Stat Modifier, Skill Tree
• Skill System - Offensive, Passive, Buffs, Casting, Cooldown, Aoe, Single Target, Upgrades, Overheat mechanic, Modules to create own skills
• Skill Tree - Manage your Skills and gain Skill Points per level up
• Stat / Attack / Element Bonus - Scale your stats based on Item Level, Rarity and other parameters
• Leveling System - Each level up gives you Stat and Skill Points
• Character / Spendable Stats - Increase your Stats by investing Stat Points
• Status Effects - Stacks, Stat/Element/Attack Bonuses, Debuffs, Damage over time and more
• Crowd Control - Freeze/Curse your enemy, change the behavior or anything else you have in mind!
• Inventory System - Equipment, Requirements(Class, Level..), Consumables, Stackable, Weight, Currencies and more
• Item Refinement - Upgrade your gear and make it more powerful! +1, +2, +3..
• Item Rarity - Uncommon, common, Legendary, Ancient.. add as many as you want and increase the Item Bonuses for each Rarity separately!
• Item Socket/Gem Slot - Add Sockets to your Item and add special items into it to make it more powerful!
• Drop System - Create loot crates, loot pools. Generate dozen varieties of one Item similar to other Popular ARPGs
• Interact System (Interface based) - Interact with any type of objects (Items, Doors, Treasures, NPC's..)
• Crafting - Combine or create new items
• Advanced AI - Highly Optimized, can use Skills, Stat Bonuses, Equip Items, Spawn Slaves(ads) etc.
• Custom Projectile Collision - Own Collision Method which runs up to 40% faster than traditional methods!
• PvP - (Toggleable) Battle with your friends for fun!
• Widget Examples for all systems
• Top-Down Example
• Third-Person Example
• In-Editor Tutorials - Over 30+ Tutorials that guide you right away in the Editor! (Available in our discord)
• Chat support (Discord, Email) and optional TeamViewer(Desktop sharing) for verified buyers with special needs

Orbital Market Link