Lerasium overwrites Spiritual DNA. It can do some interesting things, and can overwrite your Spiritual DNA in different ways if you do it right. If a Surgebinder ate lerasium, he would become an Allomancer, but Brandon implied other things could be done.
If you are viewing this on github.io, you can see that this site is open source. Please do not try to improve this page. It is auto-generated by a python script. If you have suggestions for improvements, please start a discussion on the github repo or the Discord.