When a weapon is infused with Mundane, its base damage will drop drastically and it will lose any scaling it had prior. ... This can be any stat, meaning that if the player's lowest stat is in Vitality, the weapon will now scale with it. This scaling will be the same regardless of the weapon.

What is the point of mundane infusion?

Used to imbue weapons with power of the mundane. This reduces the normal scaling a weapon has, but adds a mundane scaling. Weapons that are mundane imbued lose half of their base damage and scale in damage based off of your lowest Stat.

Should I infuse my weapon Dark Souls 2?

You can infuse your weapons, but it might be easier to just summon another player in your case. Infusions cause your weapon to perform additional effects with varying power based on your stats (Lightning infusion scales with Faith for example). Your best bet would be to use Gold Pine Resin.