Originally Posted by elizah72
an "accident" or possibly the entity getting freed and attaching to another character, who then changes Algrim to Kurse (as previously speculated, possibly this is the Jane possession moment)
or maybe Malekith posesses her?
I am still on board with the tesseract just simply being an artifact of immense power, that takes a lot of knowledge to know how to use it, or understand it. Though it containing a spirit or something would be actually really cool.
whether it be sentient or not, an artifact of that power, can certainly changed a confused little elf into Kurse.