Honor classes go from -18 to 20; each has a minimum number of points and the points needed to move up.
Class 1 starts at 10,000 points and class 20 at 2,000,000,000.
Honor points come from some quests, hunting on war maps, clearing mission dungeons and the Nation War; the honor class lets you buy or use certain items.
See also: In-game help: Honor · Honor rank
Data from the Cabal Latino server and client (EP33).