At level 103 two Champion questlines are available:
1. Recruiting Rexxar, Survival Skills & Survive the Night, which give Champion: Rexxar that grants the Champion follower [champion=743].
2. Calling Hilaire Home and Bite of the Beast, which gives Champion: Beastmaster Hilaire that grants the Champion follower [champion=744].
To unlock these, you'll first need to complete a seemingly unrelated short quest chain in Val'sharah, offered by [npc=107317] at Trueshot Lodge at 41.7 59.99 who gives you the breadcrumb: Lending a Hand. Turn this in to [npc=107372] and do Rising Troubles and Assassin Entrapment. At this point, [npc=113325] should appear beside [npc=107372] and offer you Urgent Summons.
Note that [npc=113325] didn't appear for me until I'd obtained all three artefact weapons.
[npc=107425] is in Highmountain at Cliff's Edge, which is 200 yards NW of The Witchwood flight point at 36.73 35.39. For those without coordinates, that's on the first E of Edge on the map. Hints: You only need one piece of wood per quest to light the fire, berries aren't necessary, you only need four pieces of cooked meat to survive "overnight".
[npc=107316] is Stormheim, just North of Weeping Bluffs, about 300 yards North of the nearest flight path at Skyfire Triage Camp. Hint: Deliver Zoarg's Head to [npc=107460], as [npc=107316] really doesn't want it!
Coordinates for TomTom / Paste users are:
/way Val'sharah 41.7 59.99 Hudson Crawford quests unlock level 203 Champions
/way Highmountain 36.73 35.39 Rexxar
/way Highmountain 36.66 36.49 Dying tree only need one
/way Stormheim 34.7 41.6 Beastmaster Hilaire
/way Stormheim 38.18 37.63 Bite of the Beast - Felscale Cavern for Zoarg's Head
/way Stormheim 30.26 40.56 Bite of the Beast - Give Zoarg's Head to Archmage Landon
/way Stormheim 34.7 41.6 Hand in Bite of the Beast to Beastmaster Hilaire