A Survival Guide For A Time Stranded Wizard

I hve been reincarnated in the worst possible era. This century was an age of brutality. Much of the period is covered in a cloud of obscurity that has caused it to be termed a ‘dark century’(dunkles Jahrhundert) or an ‘obscure age’ (secolo oscuro), or an ‘iron age’ . The dreaded 10th century Europe. And thats not the worst - "AVADA KEDAVRA"