Where can I find the "Trap the Soul" 8th-level wizard spell?

Question

In the Wizard spell list, under level 8, there is a spell listed as "Trap the Soul". However the spell can not be found in the subsequent spell descriptions.

Some people online are saying that the spell was folded into the "Imprisonment" spell; however, that spell is level 9 not 8, and is listed as a Warlock Spell, but not a Wizard spell.

Furthermore, the spell "imprisonment" doesn't trap any souls; it only imprisons the body of the target into either beneath the earth, chains, a prison on a demi-plane, by putting the person to sleep, or by shrinking the person to 1 inch and trapping their body in a gem.

Where can I find the spell description for "Trap the Soul"?

Answer 1

Trap the soul should not be on the wizard spell list. This was confirmed in a pair of tweets from Jeremy Crawford in 2014. This is because Trap the Soul has indeed been merged into Imprisonment, along with many other spells:

Was trapped soul replaced with imprisonment? Is imprisonment supposed to be on the wizard spell list?

Trap the soul shouldn't be on the spell list. But yes, it is correct that imprisonment is there.

Is this because "trap the soul" is virtually the same as the minimus containment part of 'imprisonment in effects?

The imprisonment spell has absorbed several other spells, including trap the soul.

Answer 2

According to this reply by GladiusLegis on a post on Wizards of the Coast's old forums about this spell:

Trap the Soul was folded into the 9th-level Imprisonment, pretty much, as one of Imprisonment's forms is trapping someone in a tiny gem.

I have no idea on how concrete this is.