Final answer:
Thetis made a fatal mistake by seeking eternal life for Achilles, leading to his downfall in battle. This error fueled Achilles' rage and ultimately resulted in the death of his comrade Patroclus.
Explanation:
Achilles' mother, Thetis, made a mistake of wishing eternal life for her son when following through on the promise made by the gods. This mistake ultimately led to Achilles' demise as it left him vulnerable in battle where his dear comrade, Patroclus, was killed. Thetis' fear for Achilles stemmed from the consequences of this mistake, knowing his eventual destiny.
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