Kureji Lufia is a hack by Artemis that makes all bosses in the game significantly harder...and not just by higher stats mind you. Most bosses have new gimmicks you'll need to know about just to survive against them.
Additionally, I'm playing on the Fruely Hardcore version which further buffs the endgame bosses, Egg Dragon, Master, and changes what's available in some shops plus some enemy drop rates.
The latest version can be found here:
ROM will need to be found on your own though.
During the few days I've been grinding for blue chest items in the Ancient Cave, I got lucky and came across a red chest with a Dragslayer in it. Considering the floor I was on, why not give it a test drive against some of the meanest enemies the dungeon has to offer.
There's three flavors of dingbat dragons. Copper is the weakest, Silver is the next rank up, and Gold is the strongest.
Stats wise, they all have the same amount of HP, 5000. Weaknesses are the same across all three types (shadow, anti-flying, and anti-dragon). Resistances and immunities differ depending on the dragon type, but all three share a common immunity to light & earth.
As for attacks...this is where they are all scary. Copper Dragons get 1 turn each round, Silver gets 2, and Gold gets 3. Each dragon has a normal attack carrying a 100% chance to inflict a status ailment. Copper inflicts sleep, silver inflicts paralysis, and gold inflicts confusion.
Each dragon also has a signature party wide nuke doing a ton of damage. While copper & silver's have elements (thunder & ice respectively), gold's has no element.
From there, each dragon has their own unique moves. Copper has Mirror, silver has Courage & Dread, gold has Zap and a unique move called Energy Steroid. That move boosts the attack power of all enemies by 50% and fully refills their MP as well.
As for the final kick in the pants? All three dragons, when under 2500 HP, will always cast Champion on themselves for 1375 HP worth of healing.
So, how to deal with these nightmares?
Simply put, you need at least one weapon with a shadow, anti-flying, or anti-dragon element. Don't even think of trying these critters on otherwise, especially if you don't have the gear to resist their status effects.
Since I had a Dragslayer, I let Dekar use it. It's IP move can easily do close to or over 4000 damage if Dekar is buffed up. Guy can also use it should you have some other plans for Dekar or if someone else is taking his place in battle.
The key here is to get their HP as close to 2500 as possible, then lay the hell into them and wipe out that last 50% of their HP before they can possibly do anything about it.
Hopefully you picked up something like Champion or Valor so Maxim or Selan can heal every turn. You will need it.
Now, in the case of fighting two Gold Dragons, things are far different. Considering they have three turns each and can very well use Stardust Blow all three times if they really wanted, the only way I could defeat them with my gear I had was to get a surprise attack on two of them, then have Guy weaken one Gold Dragon enough with Gades Blade's Octo-Strike IP move for Dekar to follow up with a killing blow via Dragslayer's Dragon Rage IP move. After that? Pray. I got massively lucky here that the lone Gold Dragon didn't go for a triple Stardust Blow there on the next turn.
Drops wise, coppers have nothing, but silvers can drop Sea Rings while golds can drop Tweak Rings, all at 10% rates.