[coolWave]

I know there are 4 kinds of "high level" ores.
By "high level" i mean Lv 171+
Three of those four are 10k Steel, Ori Harkon, Adamantite.

My question is that how are they being used?
And what's the 2nd ore I missed?

Am I correct to assume this:
Lv1 - 4 : 10k Steel
And help me out with the next levels >.<

Thanks in advance