Skills
Every skill a character can learn, laid out the way the game's own window lays them out: a race, a tab, a mastery, and the lines of skills within it.
One-hand sword · Two-hand sword · Dual axe
Three lines in one tree: one-handed sword with a shield, two-handed sword, or dual axes, with Guard Barrier behind them if you carry the shield. Full strength, like the Rogue and unlike the four casters.
The tank, and the two pairings rated highest are both PvP ones: with Cleric for the heals, the armour buffs and the reflect that turns a fight around, and with Warlock for the debuffs. A European carries two masteries, so that pairing is the build.
Warrior Mastery
12 lines · 69 skills
Each row is a line of skills and the icons along it are its successive versions, which is how the game's own window draws them: the number on an icon is the skill's highest level, and pointing at one shows it at that level. The grid, the rows and their names are the client's own, and every number on it, mana, attack power, skill points, cast, cooldown and range, is read out of the game's files and fitted against its own tooltip. What a mastery is for, above, is the one thing here that is not: that is what the community says these trees are for, checked against the build guides rather than written from memory.