ketamines the safest dissaccociative their is, its like a third plateua dxm trip. its really hard to die using it, proberly impossible, cause it used to be used as an anesetic(s/p?) on humans to knock 'em out before surgery and the amount you take to trip is less than the dose doctors would have given you to do surgery, so its a safe drug. their is of course the chance of freaking out, thats why doctors no longer administer it as an anesetic, but since you are looking to trip on it you proberly wont be as freaked out as some old lady who went into hip surgery and the doc gave her something that sent her to the moon.