you start off being able to get level 10 dragons
at level 20 you can get the magic temple for 500,000 gold, instant build but needs 6 friends to open and start leveling dragons up to level 15

at level 25 you can get the noble temple for 1,500,000 gold, instant but needs 6 friends to open and start levelling dragons up to level 20

at level 30 you can get the knight temple for 5,000,000 gold, 24 hour build and no friends needed to open. levels dragons up to level 25

at level 35 you can get the master temple for 25 gems, 24 hour build and no friends required to open, it levels dragons to the maximum level allowed -30