Conflict with the Eternals
According to How to be a Time Lord, the Time Lords, following the Sontaran invasion of Gallifrey, engaged in a conflict with the Eternals, who banished the Carrionites into the Deep Darkness. (PROSE: How to be a Time Lord [+]Loading...["How to be a Time Lord (novel)"]) According to one account, the Eternals had banished the Carrionites along with the Hervoken. (PROSE: Forever Autumn [+]Loading...["Forever Autumn (novel)"])
According to one account, a temporal skirmish opposed the Eternals to the Halldons, but an end was brought to it by the Time Lords, in one of the very few time wars they would fight prior to their great War with the Daleks. (PROSE: Meet the Doctor)