A notable parish was also relegated for the first time in half a century.
Rhode and Tullamore will meet in the 2020 Offaly Senior Football Final.
Tullamore came through the first ever penalty shootout to dismiss reigning champions Ferbane, while Rhode had a more conventional path in seeing off Edenderry.
Championship top scorer Niall McNamee added a crucial goal in a four point win for Rhode.
The results in full:
Rhode 1-14; Edenderry 0-13.
Ferbane 1-14; Tullamore 0-17, Tullamore winning 9-8 in the shootout.
ElsewhereClara have been relegated from the senior football championship for the first time since the 1950's.
They were defeated by Bracknagh in the relegation playoff on a scoreline of 2-17 to 3-11.
2-1 from the boot of Ronan Galbrith helping last year's intermediate champions retain their senior status.
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