Shadowed´s Legit & Smart Auto Totem

The mod watches the inventory and places a totem into the offhand slot when one is needed. Each swap waits for a delay that the player sets as a minimum and a maximum in milliseconds, drawn at random from that window so the timing resembles normal combat reactions rather than instant inventory packets. Auto-Restore Offhand remembers the original offhand item, such as a shield, and returns it after an emergency totem is consumed.

Smart Death Protection skips the configured delay when a fatal hazard is predicted. It forecasts the lethal fall damage a player would take from a high-gravity drop by weighing current health, absorption, fall distance and how fast the player is descending, and it likewise responds when lava drops a player below two hearts, when oxygen reaches zero, and when arrows, tridents or instant harming II potions are projected along their straight-line paths up to eight ticks ahead. Combat Mode Only limits swaps to moments when the player takes damage or a hostile entity is nearby.

The mod is a Fabric build for Minecraft 1.21.1 only, published as client-side only, so servers do not need it. It is released under the MIT License and is not open source. The MissingMM mod is named in the author text as a dependency that still needs support, so it is not confirmed as required.