Horn
Spoiler Warning: This page contains spoilers which may affect your IVAN experience negatively
There are two kinds of horns: one that induces fear, and one that soothes it. Both horns take time to 'recharge' their effects. (exactly how long that takes I don't know.)
Horn of Fear
The Enner Beast will yield one when killed; you may also find one in a shop or just lying about.
Applying this tool ("You produce a frightening, will frighten off almost any hostile in the immediate vicinity. You cannot scare a Golem as they are emotionless magical constructs. Named Characters and Unique Monsters are also immune to the horn's effects.
Success: "You produce a frightening, almost scream-like sound." Failure: "You produce a mighty sound."
Horn of Bravery
Applying this tool will negate Panic for you and any ally in a one-square radius.
Success: "You produce a loud but calming sound." Failure: "You produce a mighty sound."
Weight reduction
The Horn of Fear can be hardened all the way to Green Light Crystal and the Horn of Bravery to Diamond. While as of yet horns are among the Invincible Items in all versions of IVAN (variants included), you might want to harden or SoCM the Horn of Bravery to a lighter material. The original item weighs in at a whopping 4200 g - more than most weapons!
