They seem to have permanently removed Deus Vault, and those unique dragons are available for breeding in the breeding mountain. But the dragons to be breeded need to meet the specific level stated in the shop. For example, a Great White Dragon is element Ground and Ice, and parental level stated is 10. The parents need to be at least level 10 to breed. No receipes are acquired for all dragons available for sale in the shop - they are available from breeding mountain/tree, I guess.