MOBA - Multiplayer Online Battle Arena

A turn-based RPG built with Phoenix LiveView, online since 2020.

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Summary

Stack: Elixir 1.16 · Phoenix 1.7 · LiveView 0.20 · PostgreSQL

Gameplay: 20 avatars · 20+ skills · 25+ items · 7 league tiers · 1v1 duels · 5v5 matches

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Technical Highlights

Domain-Driven Architecture

Game orchestrates all gameplay modules. Engine orchestrates all battle-related modules. Both use defdelegate to expose clean public APIs.

flowchart LR
    Moba --> Game & Engine
    Game --> Heroes & Training & Arena & Items
    Engine --> Battles & Processor & Spell & Effect

Key files:

• lib/moba.ex — Cross-domain orchestration
• lib/moba/game.ex — Gameplay orchestrator
• lib/moba/engine.ex — Battle orchestrator

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Composable Battle Engine

Skills and items are defined as chains of small, pure effect functions. The Spell module uses pattern matching as a DSL for skill definitions.

flowchart LR
    A[Skill Cast] --> B[Spell]
    B -->|pattern match| C[Effect Chain]
    C --> D[Updated Turn]

Key files:

• lib/moba/engine/core/processor.ex — Turn processing pipeline
• lib/moba/engine/core/spell.ex — Skill/item definitions via pattern matching
• lib/moba/engine/core/effect.ex — Composable effect functions

Why this pattern:

• Adding new skills requires only new function clauses
• Effects are pure functions, easy to test in isolation
• Battle logic completely decoupled from persistence

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Features

• Hero Building — Choose from 20 avatars, 20+ abilities, and 25+ items to train your custom hero
• PvE Training — Battle through 7 leagues and a boss fight to compete for the fastest completion time
• Account Progression — Master all playstyles with full account leveling and season leaderboards
• Competitive PvP — 5v5 team battles with skill brackets and 1v1 real-time duels

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Setup

mix deps.get
mix ecto.setup
cd assets && npm install && cd ..
mix phx.server

Visit localhost:4000. Admin login: admin@browsermoba.com / 123456

Tests

MIX_ENV=test mix ecto.setup
mix test