Post#2 » Tue May 05, 2020 7:38 am
Worn and worn2 effects will stack but you're looking at two different effects, so it's not +85% pet power.
Pet power (this comes with the xxx minion focii) boosts your pet's stats when summoned and only the best version of this effect on your gear applies. So if you have Immortal minion (the best you can get) on any item of gear, your pet will be summoned with the best possible base stats.
The other effect (+15%) is pet damage. This applies as a worn buff so normal stacking rules will apply with other worn effects.
Pet power does enhance base damage. Just not by 70%. I'm not 100% sure what the value is as it's in source.