Aquamancer

Overview
Aquamancer is a flexible CC-oriented Support that offers numerous ways to disrupt the enemy's formation. Instead of possessing a single Ultimate skill like most classes, each of the Aquamancer's spells has a powerful Overflow version that rivals an Ultimate.

The Aqumanacer gains Water Flow stacks from hitting enemy players with spells. After accumulating enough stacks, these stacks can be consumed all at once to unleash an Overflow version of a spell.

Instead of an Ultimate, the Aquamancer's 4th skill is Stream, a secondary passive that can be leveled up. Each time Stream is upgraded, it permanently reduces the amount of Water Flow stacks required for unleashing an Overflow spell.

Thanks to Stream, Aquamancer can unleash Overflow spells more often as the game goes on. During the late-game, when team-fights are commonplace and there are plenty of opportunities to stack Water Flow, the only thing stopping Aquamancer from spamming Overflow spells is the individual cooldown of each Overflow spell. These cooldowns aren't as long as the cooldown of the average Ultimate, but they're long enough to stop the Aqumaancer from abusing Overflow nonstop.

Aqumancer's Splash is one of the few skills in the game that can negate special defensive properties, such as Paladin's Aegis and Vampire's Coffin Slumber. As such, Aqumancer is often picked to counter lineups that heavily rely on such defensive properties.