Last words somewhat difficult? I'm a taskmaster (8)

I believe the answer is:

ultimata

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'last words' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

'somewhat difficult? i'm a taskmaster' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'ULTIMATA' can be found hidden inside 'difficult im a taskmaster'.

Can you help me to learn more?

(Other definitions for ultimata that I've seen before include "Final demands" , "Final offers" , "Last offers" .)

I've seen this clue in The Independent.

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