EQUIP a stim beacon. FIRE to toss the stim beacon in front of Brimstone. Upon landing, the stim beacon will create a field that grants players RapidFire.
[X] Orbital Strike is best used combined with a teammate's slow (like Sages [Q] Slow Orb) or to deter defenders from disarming the spike during countdown.
You can generously extend the range of [Q] Incendiary by aiming high and bouncing it around corners.
Brimstone's [E] Sky Smoke is one of the most useful abilities in the game. At the start of a round look to smoke off sight lines and hallways your team is making a push for.
You can pre-set these before the walls drop so it instantly casts as the round starts.