minecraft-kajetans-text-core-mod/src/main/java/me/ktcm/KajetansTextCoreMod.java

package me.ktcm;

import net.minecraft.util.text.StringTextComponent;
import net.minecraftforge.event.ServerChatEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;

@Mod.EventBusSubscriber
@Mod("ktcm")
public class KajetansTextCoreMod
{
    @SubscribeEvent
    public static void beforeStart(ServerChatEvent e) 
    {
        e.setComponent(new StringTextComponent(
            e.getMessage().replace("&", "§") + 
            "§0█§1█§2█§3█§4█§5█§6█§7█§8█§9█§a█§b█§c█§d█§e█§f█" +
            "§g█§h█§i█§j█§p█§q█§s█§t█§u█§v█§w█§x█§y█§z█"));
    }
}