The term "Dragon Slayer" can refer to various swords or weapons in different contexts, including mythology, literature, and video games. Therefore, there isn't a specific weight attributed to the Dragon Slayer as it depends on the specific depiction or interpretation.

If you are referring to the "Dragon Slayer" sword from the manga and anime series "Berserk" created by Kentaro Miura, it is an enormous and fictional sword known for its immense size and weight. In the series, the Dragon Slayer is depicted as an oversized and bulky weapon, often requiring the strength of a behemoth like the protagonist, Guts, to wield it effectively.

However, since the Dragon Slayer is a fictional weapon, its weight is not specified or quantified. It is intentionally portrayed as a massive and formidable sword that defies conventional proportions and realistic weight standards.

It's important to note that practical and historically accurate swords are typically designed to be balanced and wieldable. Swords that are excessively heavy can become impractical and unwieldy in combat situations.