13 days later.. Obsidian has broken out of the hospital! His fevers were deemed "culture negative sepsis" after several tests, CTs, and scopes to try to find a source. Several different antibiotics, fluids, and a blood transfusion later, we are three days without a fever and on the way home! 

His blood pressure has been affected by the medication and excess fluid on his body, so we will be monitoring it closely for a while to watch for hypertension, but otherwise, he is mostly back on track to continue his treatment as planned.