All 4 Uses

pinnacle
in
Riders of the Purple Sage
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The corners of wall bluntly rose, scarred and scrawled, to taper into towers and serrated peaks and pinnacled domes.
Chpt 4 *

pinnacled = with high, tapered architectural features such as spires
He raised his glance and saw light between row on row of shafts and pinnacles and crags that stood out from the main wall.†
Chpt 8
Crags and pinnacles, splintered cliffs, and leaning shafts and monuments, would have thundered down to block forever the outlet to Deception Pass.†
Chpt 8
Huge pinnacles and monuments of stone stood alone, leaning fearfully.†
Chpt 23

Definitions:

(1) (pinnacle)
the highest point -- either literally, like the top of a mountain, or figuratively, like the peak of success or achievement
(2) (meaning too rare to warrant focus)