@XiphiasGladius- I am also a native English speaker, born and raised in America, and prowessed is definitely a word. No matter what the use, whether it's an everyday word or not, I have encountered it many times in context. Just because people don't say it a lot doesn't mean it's a dead word...
well, another day, another money sucking-match. enjoy your 1-star rating, money-farmers. I was in sudden death, "Production x2!". well, my production SLOWED DOWN, meanwhile my opponent was making tanks a mile a minute. Seems legit......
my noob (howitzer spammer, no skill whatsoever) teammate surrendered, even though I was carrying him and winning the match. Seems odd that I was punished.