Blowing a tin whistle makes any watchmen on the level converge on you. They won’t be angered, but may be slightly miffed about the false alarm and/or get angered if you keep abusing it.

Artifact whistle Nightingale, based on the Nightingale Robber from Russian folklore. When blown, it causes various effects to monsters in a sizeable radius: stunning, confusion, scaring, possibly even instadeath if they are weak monsters or have low HP (or just HP damage). Any of those effects can also happen to the player. The player is guaranteed to become deaf for several dozen turns from blowing the whistle.

As a limiting factor, it will only cause these effects if blown when its invoke timer is ready, and blowing it will internally set its invoke timer as if you invoked it. If blown when its invoke timer is not ready, it will just behave like a regular whistle (and no “ignoring you” message will be shown).

Applying a blessed whistle (either type) will unparalyze pets in range.

The Watch should turn hostile when you apply a cursed tin whistle within earshot of them (because it produces a shrill whistling sound).