Formal/Serious:
* The judge delivered a magisterial ruling, leaving no room for doubt.
* The historian's magisterial work on the Roman Empire is considered definitive.
* The professor's magisterial presence commanded the attention of every student in the lecture hall.
More Figurative:
* The old oak tree stood magisterially over the field, its branches reaching towards the sky like ancient arms.
* The chef, with his magisterial air, surveyed the kitchen as his team prepared the final dishes.
* The mountain range stood magisterially on the horizon, its peaks piercing the clouds.
With a Touch of Humor:
* My cat, with his magisterial air, expects to be served breakfast in bed every morning.
The word "magisterial" conveys a sense of authority, importance, and often a touch of formality. It can be applied to people, objects, or even situations.