Book 4 (Air) Guide: Love Route vs. Slave Route Endings

The Final Crossroads

You have arrived at the climax. After navigating the Water Tribe, mastering the Fire Nation economy, and solving the Earth Kingdom’s logic puzzles, Book 4 (Air) presents the single most critical decision in Four Elements Trainer.

Unlike the previous chapters, which largely followed a linear progression with minor deviations, Book 4 completely bifurcates the narrative. The game engine checks hundreds of variables set during your previous hours of gameplay—specifically morality and corruption—to determine your path. Players often find themselves accidentally locked into a “Dark” ending because of a dialogue choice they made in Book 1, or conversely, unable to access the “Slave” content because their reputation is too high.

This guide deconstructs the logic behind the Love Route and the Slave Route, ensuring you navigate the specific “flags” required to unlock the ending you desire.

Quick Reference: The Route Comparison

For players standing at the decision point right now, this table outlines the fundamental differences between the two narrative paths.

The Technical Why: How the Game “Decides”

Why can’t you simply choose a route from a menu? The Ren’Py engine treats Book 4 as the checksum for your entire save file.

Think of the game’s logic like a credit score. Every time you chose a “Force” option in Book 1 or Book 2, the game added a hidden point to your corruption counter. When Book 4 initializes, the script runs an if/else check.

• if morality > threshold: jump love_path
• else: jump slave_path

While some versions of the game allow you to manually select the path via a dialogue prompt with Tenzin or Korra early in the chapter, your previous stats heavily influence the success rate of actions within that route. A player with maximum “Corruption” trying to play the “Love Route” will find affection checks nearly impossible to pass without cheats.

Deep Dive: Navigating the Routes

Path A: The Love Route (Vanilla)

This path is considered the canonical “Hero” storyline. It focuses on courting Korra and re-establishing relationships with Katara, Azula, and Toph based on mutual trust.

• The Trigger: When arriving at Air Temple Island, choose dialogue options that are respectful to Tenzin and Korra. Avoid “peeping” or aggressive options during the initial days.
• The Asami Factor: The Love Route heavily features Asami Sato. Unlike the Slave route where she is a target, here she is a romantic partner. You must balance your time between Korra and Asami to trigger the “Shared” ending events.

• Critical Fail State: Be careful with the “Spirit World” events. Choosing the dark option during the meditation sequences can inadvertently flip your status back to the Slave path.

Path B: The Slave Route (Dark)

This path flips the genre from a dating sim to a management sim. The goal shifts from “wooing” characters to “breaking” them.

• The Trigger: This route is often triggered if you pursued the “evil” path in previous books. Alternatively, you can force this path by selecting the “Dominance” options when Korra loses her bending abilities.
• The Mechanic: You will gain access to a “Hypnosis” or “Training” menu unique to this route. Success depends on your dominance stat rather than affection.
• Warning: This route contains “NTR” (Netorare) themes where other characters may interact with your partners. If you dislike this content, avoid this route entirely.

Locked Out of the Route You Want?
If your morality stats from Book 1 are preventing you from playing the Love Route, you need a Save Editor.
Download Latest Version
(Includes “Route Unlocker” Mod to toggle between Love/Slave paths)

Trust & Reality Check: The “NTR” Trap

What Most Sites Won’t Tell You:
Many players accidentally trigger “NTR” scenes in the Slave Route thinking they are just standard “harem” scenes. The game does not always clearly label these events. Once triggered, they are often irreversible in that save file.

Daniel’s Exclusive Tip:
The Master Save Strategy: Before you trigger the “Welcome to Republic City” event (the start of Book 4), create a manual save file. Name it PRE_BOOK_4. Do not overwrite this. This allows you to play one route, then reload and play the other without replaying the 20+ hours of the first three books.

• Need to fix your stats?
  If you are locked out of the Love Route, use console commands to adjust your morality. Find the codes here: Four Elements Trainer Cheats & Console Commands List.
• Save File Issues?
  If your Book 3 save isn’t loading into Book 4 properly, read our transfer guide: Save File Location: How to Transfer Saves on Android 11+.
• Stuck in Book 3?
  Missed the Obsidian required to finish Earth? Go back and check our Book 3 (Earth) Walkthrough: Toph & Obsidian Locations.

Frequently Asked Questions (FAQ)