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'On the first day of Christmas, my Challenge? gave to me
A Treguard who says "Oooh, Nasty".'

It just about scans.

'On the second day of Christmas, my Challenge? gave to me
Two clue items
And a Treguard who says "Oooh, Nasty".'

'On the third day of Christmas, my Challenge? gave to me
Three dungeon levels
Two clue items
And a Treguard who says "Oooh, Nasty".'

'On the fourth day of Christmas, my Challenge? gave to me
Four quest objects
Three dungeon levels
Two clue items
And a Treguard who says "Oooh, Nasty".'

'On the fifth day of Christmas, my Challenge gave to me
Five frightknights
Four quest objects
Three dungeon levels
Two clue items
And a Treguard who says "Oooh, Nasty".'

LOL, I was hoping people might continue that. Thanks, James

*Puts thinking cap on*

Now it just gets ever so slightly more difficult

'On the sixth day of Christmas, my Challenge gave to me
Six witches cackling
Five frightknights
Four quest objects
Three dungeon levels
Two clue items
And a Treguard who says "Oooh, Nasty".

My 6 witches, for the pedants like me out there: Heggatty, Peggatty, Greystagg, Mrs Grimwold, Mildread, Mistress Goody. Yes, some of them might be more "hags" than technically witches, but they're being included. And I'm sure although we didn't see Greystagg actually cackle, she did a lot of it off-screen.

'On the seventh day of Christmas, my Challenge gave to me
Seven walls-a-riddling
Six witches cackling
Five frightknights
Four quest objects
Three dungeon levels
Two clue items
And a Treguard who says "Oooh, Nasty".

Seven Walls (including doors, not including the Brollachan, who just moved through walls): Olgarth, Granitas, Golgarach, Brangwen, Dooris, Doorkis, Dooreen. The Blockers didn't ask riddles. Yes, some asked questions rather than riddles, but it has to scan.

'On the eighth day of Christmas, my Challenge gave to me
Eight teams-a-winning
Seven walls-a-riddling
Six witches cackling
Five frightknights
Four quest objects
Three dungeon levels
Two clue items
And a Treguard who says "Oooh, Nasty".

'On the ninth day of Christmas, my Challenge gave to me
Nine jesters laughing
Eight teams-a-winning
Seven walls-a-riddling
Six witches cackling
Five frightknights
Four quest objects
Three dungeon levels
Two clue items
And a Treguard who says "Oooh, Nasty".

On the 10th day of Christmas, my Challenge? gave to me,
Ten Pookas pooking
Nine jesters laughing
Eight teams-a-winning  
Seven walls-a-riddling  
Six witches cackling  
Five frightknights
Four quest objects  
Three dungeon levels  
Two clue items  
And a Treguard who says "Oooh, Nasty".

It was all I could think of! What else do pookas do?

'On the eleventh day of Christmas, my Challenge gave to me
Eleven kidsies roaming
Ten Pookas pooking
Nine jesters laughing
Eight teams-a-winning
Seven walls-a-riddling
Six witches cackling
Five frightknights
Four quest objects
Three dungeon levels
Two clue items
And a Treguard who says "Oooh, Nasty".'

(here it comes)

'On the twelfth day of Christmas, my Challenge gave to me
Twelve Lord Fears-a-leaping
Eleven kidsies roaming
Ten Pookas pooking
Nine jesters laughing
Eight teams-a-winning
Seven walls-a-riddling
Six witches cackling
Five frightknights
Four quest objects
Three dungeon levels
Two clue items
And a Treguard who says "Oooh, Nasty".'

Phew! Done it!!!!  :)