Looks like EQEmu has had this issue for Hsagra's Wrath before.
http://www.eqemulator.org/forums/showthread.php?t=27684
Vindi, Velk, and Tormax should be the giants that it works on.
This is a 2001 Monkly Busienss thread identifying resists for some Velious bosses as well as which ones are affected by Giants' Bane (GB).
http://www.monkly-business.net/forum...hp/t-8573.html