What mechanic prevents Desolator and Mask of Madness from stacking?

What mechanic prevents Desolator and Mask of Madness from stacking? - Top view of many clean single use light blue surgical protective face mask lying on top of each other in disorder

One person from the other team (hero-sniper) was having a bad game. After about 30-40 minutes, someone noticed his build; it was Desolator and Mask of Madness. My friends started to laugh at him and make fun. I joined them to laugh but a question remained in my mind.

What is it that keeps Desolator and Mask of Madness from stacking?






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What mechanic prevents Desolator and Mask of Madness from stacking? - From above unrecognizable black man wearing protective mask on face of ethnic kid standing in room near window closed with curtain
What mechanic prevents Desolator and Mask of Madness from stacking? - Crop black man talking to girlfriend in mask on smartphone
What mechanic prevents Desolator and Mask of Madness from stacking? - Top view of crop anonymous African American coworkers surfing netbook while sitting at table with medical mask and takeaway cups of coffee during work





WTF 4Min Madness Mask Sniper | 100% Max Speed Free Hit Knockback with Desolator IMBA Hero Dota 2




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Images: Karolina Grabowska, Ketut Subiyanto, Monstera, Monstera