Elektra: Pagon

Brian Michael Bendis and Zeb Wells
Leinil Francis Yu and Clay Mann

Revolution
New Avengers #27
New Avengers #28
New Avengers #29
New Avengers #30
New Avengers #31

Mighty Avengers #16

NOTE: Reading the other lead-in issues of New/Mighty Avengers along with the main Secret Invasion series might be useful for greater context of aspects of the Marvel Universe at the time, but Elektra is otherwise not directly involved beyond the issues listed above.

Dark Reign
Dark Reign: Elektra #1
Dark Reign: Elektra #2
Dark Reign: Elektra #3
Dark Reign: Elektra #4
Dark Reign: Elektra #5