Lore based question on the old gods

Is there an established link between the Old Gods and the World Trees? I mean, Yogg Saron killed/corrupted the world tree in Grizzly Hills, Shaladrassil was corrupted irreversibly by the Nightmare, which has alleged connections with N’zoth. Teldrassil got torched too. So I’m just wondering if the world trees served as natural wards to their power, weakening them in some way, so that the Trees had to be destroyed for the Old Gods to be more powerful, or is it just a coincidence? Or did i just miss an explanation somewhere

Yes there is, they are using them to spread Emerald Nightmare:

The origins of the Nightmare stretch back to 4,500 years before the First War. Fandral Staghelm took branches from Nordrassil, the World Tree, and planted them over saronite that had begun to appear across the world, including a particularly large source of saronite in the Grizzly Hills. Unfortunately, its roots went deep enough that they touched the prison of the Old God Yogg-Saron, corrupting the tree and spreading madness throughout the nearby wildlife. The druids sorrowfully destroyed the world tree, believing that this act would halt Yogg-Saron’s corruption. What they did not know, however, was that Yogg-Saron had used the world tree to open the way for the Old Gods to access the Emerald Dream. The Old Gods spread their corruption into the Dream through the door that Yogg-Saron had opened.[7] While Yogg-Saron opened the Emerald Dream to its brethren, it was apparently N’Zoth who was most active in corrupting it. wow.gamepedia.com/Emerald_Nightmare#Origins

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