When should you enter the Myrmidex caves

Hint 1 of 5:

I recommend waiting until the tribes have united against the Myrmidex.

Hint 2 of 5:

The caves are huge, with danger everywhere.

Hint 3 of 5:

Don't enter without a lot of chocolatl for charm spells and light.

Hint 4 of 5:

Don't enter without the locator device from the Kotl city.

Hint 5 of 5:

Bring lots of black staffs and Kotl shields when you attack.