From Dragon Mania Legends Wiki
The Enchantment Altar is a building introduced in Update 2.3 as part of the Enchantment feature. The Altar is located on the Main Island next to Chronos where it sits upon a circular platform of rounded square tiles, in the center of which is a larger, circular tile, and carved into it is a Viking tribal symbol. Around the edge there are two Dragons akin to Chinese dragons, and between them is a large circular display of two disjointed rings - one large gold ring rotating slowly clockwise and a smaller teal ring floating inside of it, rotating counter-clockwise. Beneath this display is a small round altar with upturned feet, which glows a soft teal within its basin.
The Enchantment Altar can only be used after Enchantment is unlocked through leveling three Dragons to Level 16. Inside the Altar, Trainers can fuse various Enchantment Materials and use them to enchant their Dragons. When selecting the Altar, the Trainer can press the button to access the section for fusing materials or the button to access the section for enchanting Dragons.
Ascending is a unique feature, unlocked at Level 50, that allows Trainers to permanently trade their duplicate Dragons in exchange for Enchantment Materials matching the Elements of the traded duplicate. Ascension can take place by first selecting the Enchantment Altar and then the button. In this screen, the rules of ascension can be read after which the next step is pressing the button in order to proceed to the process itself.
From the selection screen that just appeared, the Trainer is allowed to choose one Dragon from all the duplicates that are currently housed on the islands or stored in the Dragon Vault. Duplicates that are in the inventory must first be hatched and will not appear in the selection screen until then. Dragons that are currently busy (breeding, skill training, Elemental awakening and so on) will appear in the selection screen, but will not be eligible for ascension.
The duplicates that appear in the selection screen are always those with the lowest Dragon Level and Enchantment Level. As these are the only two factors taken into consideration when an eligible Dragon is decided by the game, whenever two or more duplicates have the exact same levels, the displayed one will always be given at random. Once a Dragon is chosen, the Trainer will be prompted to confirm the choice through the button or to infirm it through the button.
If the choice is confirmed, the ascension process will instantly begin and will last 24 hours and can be sped up through the use of Gems. Since ascending a Dragon is an irreversible process, the same as selling, the ascended Dragon will be permanently removed from the Trainer's game. Once a Dragon has been ascended, the icon will appear above the Enchantment Altar. Selecting the Altar will then give the Trainer a chest containing between one and three material cards. In the case of Divine Dragons, the Trainer will receive a separate material card for the Divine Element, right after the material cards for the secondary Elements have been claimed. In the case of Ancient Dragons, the Trainer may receive a separate material card for the Ancient Element, right after the material card for the Divine Elements have been claimed.
The number of material cards and the quality and amount of the Enchantment Materials depend only on the rarity of the Dragon and whether it is marked with in the selection screen or not and no other factor is taken into consideration. The rarer a Dragon is, the higher the chance that more and higher-quality materials will be given. Dragons that are not full set will only give one material card for one of their Elements chosen at random while full set Dragons give material cards for all of their Elements. In the vast majority of cases, only Limited-Time Dragons bear the mark. Dragons with hidden Elements need not have their secondary Elements awoken in order for them to count for ascending.
During an ascension, the Enchantment Altar can still be used to fuse materials and enchant Dragons. While fusing materials and enchanting Dragons can also be accessed through other methods other than the Enchantment Altar, ascending can be done only through this building.