Alternity is

a fantastic scientific system, released in 1998 by TSR (the company was already acquired by Wizards of the C oast). Preceded by d20 system. Just as he used to test the vast m ajority of twenty-bones (but in conjunction with other bones, mod ifying the level of difficulty), and is based on six characteristics and extensive skill system. Publisher soon focused its attention on the newly emerging system of d20, which in 2000 brought the closure of Alternity series.