Venom Staff

Each cast throws a handful of fangs in a fan. One of them always flies exactly at your cursor and the rest spread around it, so at close range the whole burst lands on a single body and at distance most of it misses by a wide margin. The fangs also expire after a short flight, so there is a hard wall past which you are firing at nothing. Get in close and it hits like very little else at its tier.

A fang carries through several enemies but loses a slice of its damage on every body, and that loss compounds, so the fourth thing in the line is barely being scratched. Treat it as a weapon for the front rank of a crowd rather than one that cleans up a whole column. The fangs do not steal each other's hits, so a burst that all lands on one large target counts every fang in full.

The venom it leaves behind is the reason it stays in the bar even when you have flashier options. It ticks for a long time and it outpaces plain poison, so a single close pass at a boss keeps working while you go back to dodging. The tooltip claiming it fires one fang is simply wrong.