On your quest to overthrow your monster father inDragon Quest Monsters: The Dark Prince, you’ll inevitably have to fight some powerful enemies to gain strength and help out people and monsters in the world. First, it was Bernie, letting lava pour out near Dragglerock Village, and now it’s his fellow Brimstone Brother Raph causing trouble.
It seems Raph has not only kidnapped the monster Eileen’s friend Duffer but he’s also let loose a powerful monster called the Unspeakable One, so you’ll need to send him packing and rescue Duffer if you want the monsters in the area to respect you more.

How To Beat Raph
As the second Brimstone Brother after Bernie, Raph packs a similar move set to him but notably tougher,fitting the fact that Bernie ran to him for help after being beaten by you.He also enjoys using powerful party-wide attacks,similar to the final fight at the Rank E level of Endor Colosseum.
Raph likes to use Kasap to lower your entire party’s defense, andit comes with a new party-wide skill called Multifists, which can do a lot of physical damage, especially to monsters with low defense. If that wasn’t bad enough, he also has Sizzle, the upgraded version of Sizzso that he can hit you with more party-wide damage.
You’ll want your monsters to be around level 16 if they’re unsynthesized, while synthesized monsters can handle it around level 13,to ensure they have the HP to handle Raph’s damage output.
For this fight, your main priority will behaving enough healers, andmonsters with theBuff skill or Sandstormcan come in very handy:
Monsters withsingle-target Ice abilities such as CrackandKacrackle Slashdo upwards of30 to 50 damageto Raph depending on your Monsters stats.
If you haven’t used them yet,Strong Medicines can come in handyif Raph is focusing on one of your monsters in particular, and you don’t have access to Midheal yet.
As long as youkeep up with your healingand your monsters' levels aren’t too low, Raph will eventually go down, andyou’ll be able to free Duffer from this draconic giraffe’s clutches.