You can be fighting 10 shadows and all you need is a level 5 cleric and WHY DOES SUNLIGHT ONLY WEAKEN THEM IT SHOULD KILL THEM

Since a shadow is Two Dimensional, and only takes up the 2-D space it's in, just summon fire inside of it. It can't exactly go around the flames like we can, but this is D&D, not real life.

this is a *****ass monster that i hate 

Some homebrew can fix this. 

Spell Tag of Radiance

These elongated, miniature spell scrolls are inscribed with intricate arcane symbols and seem designed to be affixed to a weapon. The tags are thin and flexible, crafted from a parchment-like material that almost hums with untapped power. Each one glows with an ethereal light, faintly pulsing as if imbued with lingering magic.

When you wrap a Spell Tag of Radiance around the hilt of a sword or tie it around the shaft of a bow, the tag is absorbed by the weapon, channeling radiant energy through it. For the duration of your next short rest, the weapon gains the ability to deal radiant damage (in Lieu of it's typical damage), infusing each strike with bright, holy energy that burns through shadows and evil. The radiant damage is not just symbolic—it sears enemies vulnerable to light, making it especially potent against creatures such as undead, demons, or any being tied to the Shadowfell.

Each Spell Tag of Radiance can only be used once. The effects last until the end of the next short rest, offering a temporary but powerful enhancement that can turn the tide of battle against creatures of darkness.

While its low CR might suggest it's suitable for low-level adventures, remember that the Shadow's Strength Drain ability can easily lead to a TPK for your player party. I highly recommend offering players some ways to mitigate this threat. For example, you could hint that the Shadow is vulnerable to radiant damage, or, as a more extreme solution, reduce the Strength drain to just 1 point per hit."

Quote from Mirewood >>

Some homebrew can fix this. 

Spell Tag of Radiance

These elongated, miniature spell scrolls are inscribed with intricate arcane symbols and seem designed to be affixed to a weapon. The tags are thin and flexible, crafted from a parchment-like material that almost hums with untapped power. Each one glows with an ethereal light, faintly pulsing as if imbued with lingering magic.

When you wrap a Spell Tag of Radiance around the hilt of a sword or tie it around the shaft of a bow, the tag is absorbed by the weapon, channeling radiant energy through it. For the duration of your next short rest, the weapon gains the ability to deal radiant damage (in Lieu of it's typical damage), infusing each strike with bright, holy energy that burns through shadows and evil. The radiant damage is not just symbolic—it sears enemies vulnerable to light, making it especially potent against creatures such as undead, demons, or any being tied to the Shadowfell.

Each Spell Tag of Radiance can only be used once. The effects last until the end of the next short rest, offering a temporary but powerful enhancement that can turn the tide of battle against creatures of darkness.

 Brilliant! The Spell Tag of Radiance, courtesy of ChatGPT, only works while you are taking a short rest, making it completely useless! Once you start fighting something, you are no longer taking a short rest, so it does nothing! I suggest the Sun Blade. It actually works.