The Dragons fought their way back from a 12-6 interval deficit to earn themselve their second Grand Final appearance in their history.
The Tigers grabbed a 16th minute lead through winger Lote Tuqiri, who benefitted from the sleight of hand of halfback Robert Lui to score in the corner.
Following a number of attacking sets on the Tigers’ line, Jeremy Smith levelled the scores by wrestling over in the 28th minute.
But Liam Fulton popped a pass for halfback Lui to dart under the posts and re-establish the Tigers’ lead 12-6 at half time.
An arm wrestle between the two teams continued until Jamie Soward nudged his side in front at 13-12 with a 73rd minute field goal.
A tense finish followed but the Dragons held on to book their place in the Grand Final.