User blog comment:Scudmarx/CCC5 - Venor, the Bloodseeker/@comment-5663427-20140913145040/@comment-533780-20140913151654

That's exactly the point, you have options when it gets full up, you can trade it in for damage items and start over, or you can power it up. The Karthus ult isn't just 1000g of course - you need to buy a vial for 200g, fill it up with a PENTAKILL, and THEN you can buy the ult for 1000g!

Thanks for your comments! :D