Karthus Build Guide by
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ultimate Karthus at level 18 with full builds, the unique on an archangel fully charged, and surge the grand total of magic damage with Requim is 2163 with a 18.97 magic penetration to go with it. also heals him 108 from spell vamp masteries. the highest champion base health at lvl 18 is 2278. it would be simple to ace during or right after a team fight.