OK, so I don't really know that much about modding but it looks to me like anytime anyone casts Corpse Candle (which is what Trumanator did) you will get a Gorger. The only thing DMG did is renumber the Gorger unit to 2546. Hopefully Sombre will look at this post and shed some light, although it looks to me like the Ogres mod is changing Corpse Candle for everyone. In fact it looks to me like a number of spells (Faery Trod, Seven Year Fever) are changed, so I might not really be understanding what is going on.
Here is the relevant bit starting around line 27555:
Code:
---- 472 = gorger battlefield edges summon + berserk self - for Skrag^M
^M
#newspell^M
#copyspell "Corpse Candle"^M
#end^M
^M
#selectspell 472 -- corpse candle^M
#nreff 5^M
#damage 2546 dmged ^M
#researchlevel -1^M
#nextspell 641^M
#end^M