It was a close encounter as the A Grade players braved the Moresby heat to put up a good challenge.
Warriors were the first to score, 4-0 through Junex Steven ten minutes into the first half followed by another try, making it 8-0 through Simpi Fred five minutes later.
Both tries were followed by unsuccessful conversions.
Royals fought hard to score their first try minutes to half time, taking the score up to 8-6 at the break.