Use the following values with the givefeat code.

1976 (Devour Spirit 1)
1977 (Devour Spirit 2)
1978 (Devour Spirit 3)
1979 (Devour Soul)
1980 (Spirit Gorge)
1981 (Ravenous Incarnation)
1982 (Bestow Life Force)
1983 (Suppress)
1984 (Eternal Rest)
1985 (Satiate)
1986 (Mold Spirit)
2050 (Malleate Spirit)
2104 (Spiritual Evisceration)
2125 (Provoke Spirits)