DamageSource

public ITextComponent getDeathMessage(LivingEntity playerEntityIn) {
        PlayerEntity playerEntity = (PlayerEntity) playerEntityIn;
        String s = "death.attack." + this.damageType;
        String s1 = s + ".boundPlayer";

        playerEntityIn.getCapability(BindingCapabilities.LIFE_BOUND_CAPABILITY).ifPresent(cap -> {
            UUID uuid = cap.getUUID();
            PlayerEntity other = playerEntityIn.getServer().getPlayerList().getPlayerByUUID(cap.getUUID());

        });

        return playerEntity != null ? new TranslationTextComponent(s1, , playerEntity.getGameProfile()) : new TranslationTextComponent(s, playerEntityIn.getDisplayName());
    }