From Melvor Idle
This page is up to date (v1.2.2).
Pet ID: melvorD:Bruce
Source: Attack
Drop Chance: See: Acquiring Pets
Effect: +3 Hidden Attack Level
Part of 100% Completion: Yes

Bruce is a pet acquired by dealing melee damage to monsters while using the Stab attack style.

There is no best weapon to use in order to acquire Bruce - increasing/decreasing attack speed or using weapons with special attacks that perform consecutive attacks does not change the chance to unlock Bruce over time.