Heavy Crossbow of Warning

Ammo: bolt [5.5e]

As long as this weapon is within your reach and you are attuned to it, you and allies within 30 feet of you gain the following benefits.

Alarm: The weapon magically awakens each subject who is sleeping naturally when combat begins. This benefit doesn't wake a subject from magically induced sleep.

Supernatural Readiness: Each subject has Advantage on its Initiative rolls.

Push (Mastery): If you hit a creature with this weapon, you can push the creature up to 10 feet straight away from yourself if it is Large or smaller.

Ammunition: You can use a weapon that has the Ammunition property to make a ranged attack only if you have ammunition to fire from it. The type of ammunition required is specified with the weapon's range. Each attack expends one piece of ammunition. Drawing the ammunition is part of the attack (you need a free hand to load a one-handed weapon). After a fight, you can spend 1 minute to recover half the ammunition (round down) you used in the fight; the rest is lost.

Heavy: You have Disadvantage on attack rolls with a Heavy weapon if it's a Melee weapon and your Strength score isn't at least 13 or if it's a Ranged weapon and your Dexterity score isn't at least 13.

Loading: You can fire only one piece of ammunition from a Loading weapon when you use an action, a Bonus Action, or a Reaction to fire it, regardless of the number of attacks you can normally make.

Two-Handed: A Two-Handed weapon requires two hands when you attack with it.

Proficiency: martial, heavy crossbow Source: Dungeon Master's Guide (2024) p. 324