Delia, the Hextech Avenger is the concept for a ranged marksman in League of Legends. (She is abusable as an APC, though. I like trollbuilds.)
Like Vayne, she is designed to be a lategame champion. She is an extremly strong duelist which can even take down a tank in a few seconds. However, she is not able to outplay three people simultaneously, suffers under high cooldowns and dies easily when focused by an AP-Carry.
To help her early game and awful sustain (lifesteal items are useless on her), she has some tools to harass her lane opponents and escape from dangerous situations.
Sorry for possible grammar mistakes, English is not my native language. I am working on a lore, too.
Here the TL;DR-Version: Delia is a Jinx-aged girl with aristocratic origins in Piltower which utilitzes the chaos that Jinx creates to kill a number of persons which are responsible for the death of her lower classed-boyfriend. For this purpose, she bribed a well-known inventor to deliver her the tools she needs for this job. Finish.
- -crits won't profit from the increased crit damage anymore.
I admit, I totally oversaw that. This addition isn't really beautiful, but necessary.
- Number of Phantom Bolts reduced to 3/4/5 from 4/6/8
- Now is disabled after killing a unit or 15 seconds, preventing her from stacking these bolts.
- No longer grants bonus tenacity.
- Now always applies her Q.
- -crits won't consume the phantom bolts anymore, dealing physical damage.
Should solve the problem. Now she will only be able to decimate one unit instead of 3-4. Because of the reduced time-window, I also removed the bonus tenacity.
I don't think that the basic concept of allowing someone to deal full true damage with a basic attack isn't that bad, though. She's an anti-tank weapon, like the many anti-carries and anti-casters out there.