Colon use within speechmarks

Got a query on this dialogue:

“Reyborse is a House Saken command officer: an Isier,” Oscilon explained.

Is the : correct to be used or should I perhaps use the em dash instead?

 

How about simply:

"Reyborse is a House Saken command officer, an Isier," Oscilon explained.

?

 

I agree with KaTrian.

If you were to write this in a body of text, you may write 'Reyborse is a House Saken command officer; an Isier', implying that "an Isier" is another term for a "House Saken command officer". However, as you have it in dialogue, a simple comma will suffice, just to offer that slight pause between the two.

 

Ok, sounds good commas work. I just thought I could have tried something more discerning and showy...

 

Or, Oscilon explained, “Reyborse is a House Saken command officer ... an Isier.”

Here the pausing effect of the ellipsis accents the wow of being an Isier.

 

A comma would probably be the most common usage. I've also seen a dash used in similar situations, and I like the above mentioned idea of using an ellipsis to create the effect of a dramatic pause.

 

Showy Bad.

 

Comma or em dash. The colon doesn't work there.