I don't remember the exact teaching ranks other than
boggles 1-50.
next is gargoyles
then clay constructs in lang
then guardians
then gam chagas in muspari

You'll have to fight other things between constructs to have your defenses on par for the transition.

---

Grixlek says, "Courage is dangerous, it leads to attempts at heroics..."
Vegas asks, "What like dating?"
Grixlek says, "Nothing that dangerous I believe, but still crazy stuff."

There is no constructs on the islands what so ever.

The only construct that exists in the 500 range are Ashu Hhinvi, located near Muspar'i.