Axolotl Reckoning

A new gamemode is selected from the world creation screen. It gives the player a single companion at the start of the world, and the companion can fly alongside the player on journeys. Many hostile mobs target the companion before the player, so keeping it alive is the main pressure of the mode. If the companion dies, the player can no longer continue that world. The mode is unrelated to the vanilla game rules for hostile mobs, and removing the mod later leaves the world unplayable in that mode.