Do Abilities Stack?

[SlyFan]

For example, Hades has this ability for his Friendship Disk with Megara:

• Hades’ team’s damage over time skills do 100% more damage

And Barbossa has this Red Skill:

• Damage over time effects from Hector Barbossa or allies deal 75% more damage against studied enemies.

Do these kind of combinations stack?

[Filadae_Djaq]

I think so

[Pipsqueak]

yes, but I believe they are additive rather than compounding each other. So in this case it will be 275% damage, not 350%.