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Steve's name gradually turns red as he learns why digging down is wrong.
Config GUI makes all features optional, available in some form on every version. There are more configs in 1.5.
The nameplates of villagers can be seen without having to look directly at them (enabled by default).
When an unnamed, nearby mob is hurt, a nameplate appears to show just how hurt they are (disabled by default).

Мод Name Pain меняет цвет именных табличек игроков и мобов в Майнкрафт от зелёного к красному по мере потери здоровья. Полностью настраивается. Fabric, Forge, NeoForge.