Stacking Damage Happiness Bonus

[Squidivan]

(Should've also asked this when I asked about Armored Zhulong's happiness bonus)
How does stacking damage work?

[jellybooy]

(stacking) % dmg stacks with both 25 and 30% dmg elix. % dmg only stacks with the the 25% dmg elix that u can buy for 2plat or watch ad.
boss and elite damage always stacks.

[Archugejackmen]

The highest stacking % combo I know of is 25%dmg ad, 30%damage elix and the 25%stacking dmg (hfatima/fatima). If you open a 30%dmg elixir together with a pet that doesnt explicitly state “(stacking)”, only the highest dmg% multiplier will take place. E.g : Electra 35%>Elix 30%. Elix 30%>Arm zhul 15%. The 25%dmg ad always stacks with anything, except for the 25%dmg elix available for 100 plats on store.