Tidebinder

Tidebinder is one of the most powerful non-quest spears in the game, with a minimum level of 99. It only deals Water damage, making it next to useless against mobs who resist all elements; however, it also gives boosts to regeneration, as well as reflection chance and agility, allowing you to stay alive and avoid damage.

Identifications
It costs 624 Emeralds to Identify Tidebinder.

Lore
"This mysterious, half-liquid trident apparently holds the secret magics to control the ocean's ebb and flow. It is incapable of touching solid ground."

Trivia

 * As of the 1.14 Gavel Update, Tidebinder (along with Cluster, Cascade, Black and Sitis) has replaced Scythe as the highest-levelled tradable Legendary Spear.