To summon someone is to call them to come to a particular place. When you summon a person, you are usually asking them to come to your home or office.
Summoning is the act of calling someone or something to come to you. You might summon a spirit to help you in a magical ritual, or you might summon your friends to help you with your project.
A triumph is something that you achieve after a difficult or challenging situation. When you triumph over something, you succeed in spite of the difficulty.
A matchup is a contest between two teams or two people. The two teams or the two people will be trying to do the same things, but the one that is better at doing those things will usually win.
Mediocre is a word that is often used to describe something that is neither good nor bad. It's in the middle, and it's not very good or bad.
Counterintuitive is an adjective that is used to describe something that is not what you would expect. For example, you might say that the decision to go on the trip was counterintuitive, because it was very cold outside.
Unscrupulous means dishonest and unethical. The politician is unscrupulous because she is not honest about her political beliefs.
Nefarious means evil, harmful, or criminal. When you say that someone is nefarious, you mean that they are doing something very bad and harmful.
Foes is a word used to describe people or things that you oppose or hate. You might have a few personal foes, or you might oppose the government because you think it's bad.