Mod adds behavior "pvp tag" - if you hit another player or you are attacked - next X seconds you are in a combat state.

If you leave during this state, clone entity will be spawned on the same place with your current health. This entity will have
items in it's enventory depending on setting (can be bags, hotbar etc, more info below). If entity is killed it drops everything it
has from source player entity. On next login of the player(whose clone entity was killed) is killed as well.

If entity wasn't killed, only player's health will be changed to clone's one if it changed.

There is time period after clone will be despawn - 30 sec by default.

Big thanks to jakecool19 for very useful example in "Lands of Chaos" mod (https://mods.vintagestory.at/show/mod/847)

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KILL_AFTER_LOGIN - if true - player will be killed if his clone was killed and inventories which were selected by settings will be cleared for player

DROP_BAGS, DROP_HOTBAR, DROP_CLOTHS, DROP_ARMOR - if true, copy of inventory will be placed in the clone, if player logout during combat

SECONDS_PVP_TAG_TIMER - how long pvp state is active for player after he attacked or was attacked

TIME_TO_DISAPPEAR - how long clone will exist

By default: 

1. DROP_HOTBAR and DROP_BAGS are true; DROP_CLOTHS and DROP_ARMOR are false;
2. KILL_AFTER_LOGIN is true
3. SECONDS_PVP_TAG_TIMER - 30 seconds
4. TIME_TO_DISAPPEAR - 30 seconds