Brightshore

Elven runes line this magical adamantine blade, and it shimmers with a faint green-black sheen. The massive mithril pommel is worked in serpentine forms, while the thick crossguard depicts the long necks and open mouths of a hydra. Additionally, the blade of this sword pulsates with heat and it sears all that it strikes for 1d6 fire damage.

Hydra’s Bane: This blade craves battle, and it is driven to seek out and destroy the biggest threats on the battlefield. When fighting a huge or larger sized creature, you can use a bonus action to expend a charge and draw upon the strength of the blade. For the remainder of your turn, your strength modifier is +6 (if it is not already higher) and you do an additional 2d8 slashing damage. The sword has three such charges, and regains all of it’s charges at dawn.