EndSustain

Keeper of the Finale Path — an exclusive content mod built for CLOSING SONG.

1. Overview

EndSustain is a content-focused mod created exclusively for the CLOSING SONG modpack. It only runs in CLOSING SONG 1.6.3 or later and is not intended for standalone installation or other modpacks. It revolves around the "Finale Path", delivering a full active-skill system, finale boss mechanics, unique weapons, curios, story progression, and cross-mod compatibility protocols.

The mod is released under the MIT License.

2. Finale Path — Six-Tier Skill System

The Finale Path is the core progression system with six tiers. Tier order matches the CLOSING SONG storyline and actual boss challenge order:

Every tier has independent cooldowns, unlock checks, and network sync. Old saves have their witness flags and cooldown indexes migrated automatically to the new order.

3. Active Skill Details

Harbinger Power (Tier III)

• Key: X
• On hit, summons multiple focused lasers onto the target.
• Laser damage uses a snapshot of the player's attack damage at cast time, ensuring consistent output.
• Cooldown: 50 seconds.

Abyss Echo (Tier IV)

• Key: G (independent toggle)
• While the tidal tentacle is active, abyssal power surrounds the player and strikes nearby enemies.
• Bonus effects: Water Breathing, Regeneration II on land, and neutral attitude from Abyss creatures.

Tidal Grappling Hook

• Key: C (independent from the G-key tentacle)
• Fires a hook that pulls the player or target, with full chain rendering and retrieval-on-end logic.
• Built-in timeout protection prevents lingering hooks.

4. Endsustain Blade

The signature weapon of the mod. Its damage grows with playtime:

Damage = 745,700 × Playtime (minutes) + Enchantment bonus damage

• At around 48 hours of playtime, a single hit first exceeds the 32-bit integer limit, entering "Finale-tier" output.
• Overflow player kick: disabled by default. Enable with kickPlayersOnOverflow = true in the config.

5. Finale Execution & Boss Compatibility

The mod ships a universal true-kill protocol (TrueKillUtil) for finale executions on bosses such as Apollyon:

• Kills by writing the true health field;
• Preserves normal death animations, drops, XP, and quest completion;
• No per-entity hardcoding; compatibility is handled at the generic protection layer;
• Training dummies are protected by the generic true-health protocol; pre-hit health is restored automatically when post-checks fail, preventing the "negative health, unattackable" issue.

6. Story System

• Includes the complete 11-chapter finale story (story.json), with text matching the full CLOSING SONG storyline exactly.
• The Finale Path screen shows story chapters and skill progress at any time; screen opening stability has been optimized.

7. Small Zhanjiang Companion

• Automatically granted about 2 seconds after a player first enters the world.
• Inventory and Curios slots are checked to avoid duplicates.
• Old faulty markers are auto-compensated; if the inventory is full, the item drops at the player's feet.

8. Configuration

Config file: config/endsustain-common.toml

Main option:

9. Dependencies

Built for the CLOSING SONG modpack environment, the mod depends on:

• Champions, L_Ender's Cataclysm, Legendary Monsters, Meet Your Fight, Bosses of Mass Destruction
• Ice and Fire: Spellbooks, Celestial Artifacts
• Curios API, GeckoLib
• Iron's Spells 'n Spellbooks, Yes Steve Model
• Goety, Goety Revelation

10. Runtime Environment

• Minecraft 1.20.1
• Forge 47+
• CLOSING SONG modpack 1.6.3 or later