I am using a custom champion template, so don't mind the weird scaling at first, it will be edited out later. :)
Screpta, the Necromancer is a custom champion in League of Legends.
Theoretical Item Build
One fine day, the day Reginald Ashram disappeared, an anonymous summoner is doing his usual practice on summoning creatures from other worlds, perhaps a new champion that may join the Fields of Justice. It's then when he summoned this... weird thing. This abomination seems to look like two slices of bread with slices of vegetation and an unknown dead creature's flesh that seems to be blended and remolded for some unknown reason in between. His fellow summoners seem to be amazed at this chimaeraic creature, as it is impossible that it's an item - they cannot be summoned, only created. It doesn't seem safe for eating either, as it somehow... kills and revives itself through grilling, and then ungrilling. This poor summoner was to be relived of his duties for dooming Valoran into destruction with this unidentified substance, until he retorts and counterattacks by saying, "I summoned a champion, behold! Let it be available for summon on the Fields of Justice!". And mistaking the word "Behold" as the name of this creature, the counsels and the high-court agree to enlist it as one of the champions fighting in the League of Legends, if it can actually fight.
I wonder why I did this. Probably because I received more than one suggestion about why my concepts don't have any sort of lore, or maybe I ate a sandwich too many, or maybe I'm insane in the first place and have to undergo a rehabilitation program for excessive work on coding and html editing, or because I'm internally waging a war waiting for my academic results.
Do remember when uploading pictures to a wikia, with the format (Yourname)_(FileName).jpg, without brackets. Use this link to make your own custom champion concepts: http://leagueoflegends.wikia.com/wiki/Special:CreateBlogPage?preload=User_blog:Mineko_Charat_Lucky/Behold,_a_Sandwich