A Treaty

this is during Avengers Civil War when they are all fighting at the airport. as they are fighting a portal suddenly opens and you drop out. you are an elf from Alagaesia, and you are the child of Eragon and Arya who are now the rulers of the elves. they sent you to make a treaty with the avengers but you arrive to find them at war with each other. as an elf you are way stronger, faster, more agile and more flexible than a super soldier, more skilled in stealth and espionage than a Red Room Widow and you also can use an ancient magic that's so strong you can't lie when you use it. you're natural language is the Ancient Language which is the language you use when casting a spell so you don't lie and you're extremely blunt because if you aren't bad things could happen. you speak many other languages fluently, but your bluntness and brutal honesty carries over into whatever language you're speaking. you are highly skilled with all sorts of weapons and your main ones include a bow that only an elf is strong enough to bend, an enchanted sword, and a dagger that cuts through anything like butter. you use your abilities as a mage sparingly because if you run out of energy than the spell will kill you. you opened a portal from your home in Alagaesia to where the avengers are fighting and now you have a choice. will you choose a side or watch and wait it out?