

Eclipso: The Darkness Within ran in DC annuals during the summer of 1992. The bookends are written by Keith Giffen with pencils by Bart Sears and also consisted of 17 additional annuals and an epilogue in Valor 1 as well as a follow up in his very own ongoing series containing appearances by a bunch of heroes and the Suicide Squad.
The Darkness Within can be done as one very large omnibus or broken into 2 600 page books split somewhere around the Hawkworld Annual.
Eclipso: The Darkness Within – 2 oversized issues + 17 annuals
Eclipso: The Darkness Within 1
Superman: The Man of Steel Annual 1
Green Lantern (2nd Series) Annual 1
Detective Comics Annual 5
Superman Annual 4
Justice League America Annual 6
Demon Annual 1
Green Arrow Annual 5
Flash Annual 5
Action Comics Annual 4
Hawkworld Annual 3
Robin Annual 1
Deathstroke the Terminator Annual 1
New Titans Annual 8
L.E.G.I.O.N. ’92 Annual 3
Justice League Europe Annual 3
Batman Annual 16
Adventures of Superman Annual 4
Eclipso: The Darkness Within 2
Eclipso – 21 issues + 1 annual
Valor 1
Eclipso 1-8
Eclipso Annual 1
Eclipso 9-18
Spectre 17-18
*Eclipso 10 & Spectre 17 -18 can be found in Countdown Special Eclipso 80-Page Giant