Within 2 weeks prior to registration: Serum calcium (absolute or albumin corrected), magnesium and potassium >= lower limit of normal (LLN)\r\n* NOTE: serum calcium, magnesium and potassium can be replaced if values are below LLN Magnesium >= LLN Sodium >= LLN Calcium >= LLN Magnesium >= LLN Potassium >= LLN Serum potassium and magnesium greater than the institutional lower limit of normal (LLN). Serum potassium and magnesium greater than the institutional LLN. Serum potassium >= LLN Serum sodium >= LLN Serum sodium >= LLN Serum B12 and folate levels >= lower limit of normal (LLN) for the laboratory\r\n* Note: Patients may begin B12 and folic acid supplementation and be reconsidered for participation in the study when levels are >= LLN for the laboratory Serum calcium >= LLN Serum magnesium >= LLN Serum potassium >= LLN Fibrinogen >0.5 LLN Serum calcium >= LLN Serum magnesium >= LLN Serum potassium >= LLN Potassium < LLN Serum sodium >= LLN Abnormal LVEF (< LLN for the institution for a patient of that age) on echocardiogram RENAL COHORT: Laboratory values as follows within 4 days before the first dose of daratumumab: magnesium ? LLN Magnesium >= LLN =< 14 days prior to registration\r\n* NOTE: Supplementation may be given before the first dose of study medication Sodium >= LLN =< 14 days prior to registration\r\n* NOTE: Supplementation may be given before the first dose of study medication LVEF < LLN on screening exam LVEF below institutional LLN or below 50%, whichever is lower Serum potassium >= lower limit of normal (LLN) and serum magnesium >= LLN (electrolyte levels may be achieved with repletion or other supportive medications like potassium sparing diuretics) Fibrinogen ?0.75 LLN Calcium >= LLN Magnesium >= LLN Potassium >= LLN K+ or Mg+ < LLN. Serum magnesium ? Institutional LLN Serum magnesium >= LLN Calcium >= LLN Magnesium >= LLN Potassium >= LLN Serum magnesium >= LLN Patient must have the following laboratory values or have the following laboratory values corrected with supplements to be within normal limits at screening:\r\n* Potassium >= lower limit of normal (LLN)\r\n* Magnesium >= LLN\r\n* Phosphorus >= LLN\r\n* Total calcium (corrected for serum albumin) >= LLN Serum calcium >= LLN (if below LLN, for asymptomatic patients replacement may be initiated if clinically indicated without delaying the start of study treatment) Serum magnesium >= LLN (if below LLN, for asymptomatic patients replacement may be initiated if clinically indicated without delaying the start of study treatment) Serum potassium >= LLN (if below LLN, for asymptomatic patients replacement may be initiated if clinically indicated without delaying the start of study treatment) Serum magnesium >= LLN LVEF < LLN for the institution Serum magnesium >= LLN Serum phosphorous >= LLN Serum magnesium >= LLN Serum magnesium greater than the LLN and < 3.0 mg/dL or 1.23 mmol/L Serum sodium, potassium, magnesium, phosphate, and calcium > lower limit of normal (LLN) Serum potassium and serum magnesium ? institutional lower limit of normal (LLN).