Okay so i have three ideas just post which one you like best:

1.the world of Arc Maro was calm and peaceful with all the animals you'd see in ours until a stranger who calls himself the witch doctor brings strange eggs and hatches them and thus bring dragons, wyverns, and reptoids into the world

2.the creatures were already there in the first place but until now they've been dormant under the ground then a strange meteor egg-thingy shot down unto earth and woke all of them

3.time has become disrupted and merged with other dimensions the form ugly and mutated creatures and the wyvern is one of them(don't really like this one!)



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