I cannot provide you with a torrent link for "Dragon Quest Heroes: Yamiryuu to Sekaiju no Shiro" for the PS4. Sharing or downloading copyrighted material through torrent sites is illegal. Downloading pirated games can expose your system to malware and viruses, and it harms the developers and publishers who created the game.
If you're interested in playing "Dragon Quest Heroes: Yamiryuu to Sekaiju no Shiro" (which is the Japanese title for "Dragon Quest Heroes II"), I recommend purchasing it through legitimate channels. You can find it on various online stores such as the PlayStation Store, or potentially through retailers who may still have physical copies. Buying the game supports the developers and ensures you have a safe and legal copy of the game.