In training, the student showed a great deal of prowess and skill.
The fight with the bartender proved his prowess.
Diving is definitely Brynne's prowess.
You can basically fit it in anywhere you would normall use the word "skill." So you could say "His hunting prowess was legendary," or "She has amazing keyboarding prowess." It just means exceptional or great skill or talent. Here is the entry from dictionary.com for further reading: http://dictionary.reference.com/browse/prowess
Every track is about how tough he is, his sexual prowess, how he likes to party, or all three.
The gladiator had shown to the Arena's crowd his prowess in soundly defeating his opponent .
The Definition of Prowess: 1. Skill or expertise 2. Bravery in Battle Example scentence: He showed great prowess when fighting the opposition
He comes from a strong extended family background of sporting prowess at various levels.
Wrestling is a savored pastime that serves to highlight the physical prowess and manliness of tribes during peace time.
The boy spoke boastfully of his football prowess.
The results of the matches and all the storylines are fictional. The athletic prowess of the athletes and their acting skills are real.
The noun 'prowess' describes a superior or great skill or ability, a talent, strength or courage; great progress achieved in any field. It also has a specific meaning of bravery, especially in fighting.So, 'prowess' isn't something a person or thing can 'be'; it is something demonstrated, or achieved. The sentence 'be prowess as always' is grammatically incorrect. Similarly, the following sentences are grammatically incorrect:'Be kindness, as always.''Be sympathy, ...''Be success, ...'You might instead, correctly, say:'Achieve prowess, as always.''Demonstrate prowess, ...''Show prowess, ...'As well, you might qualify the type of prowess you're referring to, as in:'The children of this family always achieve prowess in everything they study.''Those described as heroes are frequently people who've demonstrated prowess in battle or in meeting challenges considered unbeatable.''The prowess shown by students here is exceptional, as always.''Medals and titles are awarded by many countries to honor the prowess of their military heroes.'In similar context and using a term other than prowess, you might urge a person or people to:'Be brave, as always.''Be a hero, ...''Progress well, ...''Be highly successful, ...''Be courageous, ...'Another view:It is grammatically correct only if it means something like "Let prowess remain as it has been" or "Keep on personifying prowess." Neither of these alternatives makes sense, but at least they are grammatical.If some other meaning was intended, then it is a sentence fragment, not a complete sentence.