Once a highly regarded commander of the Slithereen Guard, Slithice fell from honor following a seemingly trivial oversight. She was to find the one stolen chalice, or remain banished forever. Slithice splits into three Mirror Images, sending them to scout ahead and mislead foes. She Ensnares targets in a luminous net, then lashes out with Rip Tide to soften their armor. The enemy halts in mid-swing, lowering their weapons at the sound of a haunting aria. There they will stand, mesmerized, unresponsive to Slithice's encircling allies as they listen to the Siren Song that has lulled them to their deaths.
The DotA Naga Siren from Warcraft universe sports the same weapons as Slithice, the only difference being that the DotA version had one weapon, and four arms, while the Dota 2 has two weapons and two arms.
Song of the Siren's ▶️ sound is based on this ▶️ voice line of Naga Siren. Whether there is an extended version of that line or if the rest of the song was manually put together is unknown.