The Decaleech's tendrils absorbed blood voraciously through its needles that attracted blood like a magnet. Its flat body pulsed in response and swelled up, growing to resemble a thumping heart. With every pumping motion, its size grew, having swallowed more of the Empyrean Tusk's blood.
From the start when it latched onto the 1st Empyrean Tusk's trunk to when it started sucking in blood, the 1st Empyrean Tusk didn't feel an ounce of pain. Rather, for some reason, it wasn't even aware of its blood loss. This was why Decaleeches were a menace.
Primary Nature—Bloody Affection!
When activated, the Decaleech can attract blood towards itself and absorb it without alerting the target. While doing so, it would inject neurotoxins that prevented the target from becoming aware of its blood loss.