I made a critical build for the Aklex prime. i suppose it also fits on the Lex prime. Costs 3 forma and two primed mods, and dishes out ~3.5K physical damage. :
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Steam Community :: Video :: Warframe Weapon Build - Lex Prime [ผมไม่ "เล็กซ์" นะครับ~!!!] : (SotE : 22.17) | by ลุง