Requires the library mod Collective.

This mod is part of The Vanilla Experience modpack and Serilum's Client Bundle mod.
Passive Shield is a configurable mod which makes some changes to the shield mechanics. When a shield is held in the offhand and not in use, it will not be rendered. Whenever the player right-clicks to raise the shield, it will be shown again. When the shield is not raised, it will still negate some damage. By default 33% extra negation, but this can be changed in the config file.

The shield provides the same passive protection when held idle in the main hand.

Configurable: ( how do I configure? )
hideShieldWhenNotInUse (default = true): When enabled, the shield will be hidden unless a player presses right-click.
passiveShieldPercentageDamageNegated (default = 0.3333, min 0.0, max 1.0): The percentage of damage that will be negated when a player is hit while holding a shield that's not held high.

GIFs:
The shield is hidden when held in the offhand until raised:

Show Spoiler

The default damage without a shield:

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The shield passively negating damage when not raised in the offhand:

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The shield passively negating damage when not raised in the mainhand:

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You may freely use this mod in any modpack, as long as the download remains hosted within the Modrinth ecosystem.

Serilum.com contains an overview and more information on all mods available.

Comments are disabled as I'm unable to keep track of all the separate pages on each mod.
For issues, ideas, suggestions or anything else there is the Github repo. Thanks!