1 702.12b A permanent with indestructible canât be destroyed. 2  Such permanents arenât destroyed by lethal damage, and they ignore the state-based action that checks for lethal damage (see rule 704.5g). 3  702.12c Multiple instances of indestructible on the same permanent are redundant.
lethal dose. n. (Pharmacology) the amount of a drug or other agent that if administered to an animal or human will prove fatal.
LC50 or LC50 â Lethal Concentration [The concentration in air which is lethal to 50% of the test animals in a study. A convenient point of comparison between toxic materials with similar effects or target organs.] LD50 or LD50 â Lethal Dose [The experimental dose which is lethal to 50% of the test animals in a study.