The Dragon World has Wonders, which are the highest item of specific Merge Chains. They can be tapped for lots of goodies.
None of them can be merged further, and give additional rewards every X hours actively played in Camp.
The Last Relic Artefact chain items could be unavailable, a free Event reward or as an in-app purchase for different players before the Friendship Event 31st July, 2020. During this event, the Soul Crescent Artefact was obtainable as a reward for everybody.
||Remains of The Dragon God
||Mounds of Rich Stuff, Sharp Dragon Eggs
||Spawns Skulls, Brambles and Spooky Trees nearby
||Dragon Trees & Glowing Dragon Trees
||11 (reg) or 9 (glowing)
||Sharp Dragons Eggs/Nests, Living Stones, Sunken Chests
||8 hours 20 minutes
||Moss Covered Stones, occasionally Living Stone
||Fountain of Youth
||Sapphire Mystery Nests, Roc Eggs/Nests, Rain Puddles
||Zomblins, Stone Bricks, Piles of Riches, Rock Dragon Eggs/Nests
Spawns Zomblins every 15 to 60 minutes.
||Bonus Points, Chained Treasure Chests, Piles of Riches, and Tanzanite Eggs/Nests
||1 hour 6 minutes
||Piles of Riches, Puddles, and Points
||Butterfly Dragon Eggs/Nests, Sapphire Eggs
||Dragon Tree Leaf, Furious Life Orb, Sunken Chest, Dragon Egg Chest (Butterfly Dragon variant)
Spawns Small Life Orbs nearby
||Glowing/Twin Life Flowers, Tribal Dragon Eggs/Nests
Glowing/Twin Life Flowers
||The Golden Mushroom
||Golem Dragon Eggs, Golden Apples, Piles of Riches and Mounds of Rich Stuff.
||Magic Coins, Hero Mushrooms, Piles of Riches
||Ruins of the Sky Palace
||Tanzanite Eggs/Nests, Dragon Chests (Tanzanite Eggs/Nests variant)
||Dragonfire Shroom Forest
||Toadstool Dragon Eggs/Nests
||Lilac Unicorn Topiary
||20x Premium Eggs
||Magnificent Dragon Topiary
||40x Premium Eggs
||Vermillion Dragon Tree
||Bearer of the World Crystal
||Midas Duck Egg and one of either a Dragon Egg Chests/Dragon Nest Vaults, Midas Tree or Gold Coin
||Golden Apple of the Cosmos
||The Last Relic Artefact
||Prism Dragon Kid, Brilliant Life Flower, Prism Flowers, Young Autumn Tree, Prism Dragon Egg, Furious Life Orb