Flame Eye

This weapon can summon a bone zone to kill any monster easy

How to get: Kill Dust Sans in Determined 7 Damage: 4 per bone zone

Additional Info : For people who don’t know where the Determined 7 is, it is located in Underfell, Snowdin, and to enter you need LV50, Scythe and Gaster Hand.

More additional info:

To kill Dust, walk vertically with your ranged weapon out, and everytime he gets hit by you, jump while turning to avoid getting hit by the bone zones. I hope this helps and I wish you luck! -DarkSxhizo :)