Dragons are known to be leaders of Lizards & Drakens. It is also worth to mention that Drakens are breed from both- Lizards and Dragons.
"This summer you will learn about the true rulers of Zao.
It is the summer of the dragon, and it is really getting hot out there.
Prepare yourself for the ultimate challenge!"
Source : Tibia.com The True Rulers of Zao Teaser for Summer Update 2010- 25th May 2010
"Lizards were chasing me. Lizards, I've never seen before... well trained armies of lizard legionnaires, elite troops consisting of lizard high guards, lizard dragon priests capable of powerful magic and with an obsession for conflagration and ritual arson. There were also lizards with an overly aggressive, even self-endangering fighting style. Lizard zaoguns, this name still echoes down the dark hallways of my mind... And I saw lizards with a dark skin as if the black oily substance flows right through their veins, as if the dark presence has chosen them as a temple. Their souls must have been driven to madness...
But I saw even more terrifying creatures.... The lizard armies were led by dragons... mighty dragons. Draken warmasters full of rage and sheer power, draken spellweavers casting spells that could shatter whole armies.
Suddenly, a few ghastly dragons appeared in my nightmare. Their bodies looked as if they had failed miserably in an attempt to transform themselves... abominations, shrieking in their eternal agony. I tried to run away but I could not move my legs, I screamed... and finally woke up in cold sweat.
And now, several hours later I still feel like all my energy has been drained from my body. Something is poisoning my mind. Maybe I've already spent too much time near those black puddles. I'm afraid my curiosity might kill me this time but the knowledge I gained, the experiences I made, won't be lost. That's the reason I'm writing these letters... even if I should perish, my spirit will survive.
Yours faithfully,
Amaro
Source:Tibia.com- Terryfying Creatures Teaser for Update 8.54 27th November 2009