almost 3 years ago - Anais - Direct link
- Artillery Cannon does no damage when equipping the perk "Direct Impact"

is one of the known issues found here: https://steamcommunity.com/app/1024380/discussions/0/2995417278815441519/ (also pinned in the forum)

Could it be that you have that perk equipped? If it's not please send a mail to [email protected] with some more info on what hero you were playing, what mode, what perks you have active, and what platform you're playing on. Thank you!