Does the staff of thunder need the letter and order of thunder (Bonethunder staff que

[borgy95]

The quest is 'Drosco the zombie (good)' - i was reading the wiki o see the requirements. initially i thought i needed the 'order of thunder and a sealed letter. however the wiki indicates it could be either or?
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Loot an Order of Thunder, which you need to take to Wolten Grafe, [B]and/or a Sealed Letter.[\B]

........
You gain experience!

You will receive a Thunder Staff in exchange for turning in the Order of Thunder.

Could someone clarify if i need just one or both?
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LinK; http://wiki.project1999.com/Drosco_t...bie_%28good%29