Talk:Peridot Dragon/@comment-68.177.47.4-20120801170659

It's not available until level 11 so it can't need metal (not available until level 17 required) and must have lightning (available level 11). My guess is thus cactus and lava, which also fit with natural description of peridot (found in volcanoes = lava) and "thorny plant" = cactus. The Ruby dragon demonstrated a clever use of real-life information for the dragon requirements.