Returns the name of the skill line associated with a trainer service. For trade skill trainers, skill line is the name of the trade skill (e.g. Tailoring, First Aid). For other trainers, skill line is the name of the group header under which the skill appears (e.g. Riding, Frost, Protection, Holy, Defense, Dual Wield).
See also Trainer functions.
index- Index of an entry in the trainer service listing (between 1 and
skillLine- Name of the skill line associated with the service (