Maxing out the Living Stone gives insane rewards!

I've been farming the grass I got from Dragon Missions and other sources to keep generating stones. It feels like I've spent almost 5 days focused solely on leveling up the stones. The highest level is Stone Henge at level 11. When I keep tapping it, I get things like bricks, rock dragon eggs, and coins, and then goblin monsters appear. A few of them spawn, and if you tap your dragon to attack and defeat the goblins, a tombstone-like object appears. When the Stone Henge was created, I got one level 9 stone. I tapped it more than 10 times, wondering how long it would last, and the rewards just kept coming. I was running out of space, so I cleared some out first, then tapped again and got goblins, which I defeated haha. The second to last picture shows some of the rewards. I'm a bit scared it might disappear if I keep tapping the Stone Henge lol. It was tough getting it to max level ㅜㅜ. It takes up 9 spaces, but I'm going to keep a spot for it as long as the rewards keep coming. I'll share more later if no other pioneers post about whether leveling up the goblin tombstones or if the Stone Henge disappears after continuous tapping.ㅎ