Need Help on cloudrip treasure

[UltCombo]

The general rule of thumb is that you are able to command one tier higher than what you can summon. The My Dear Friends - Using the Boss Star thread explains this more in-depth—in fact, it objectively answers your question:

@hakelos

You can always command one level higher than you can summon. For example, with the Boss Star III, you can command paladins, but not summon them.