First thing: Be realistic about how long the campaign will run. Some groups do campaigns that go on for years and years, but that's extremely rare. In 27 years of gaming, I have never once seen a campaign go all the way; a campaign that lasted 10 levels was impressive, let alone 20. The only games that even got close to 20 were those that started in the upper teens.Our local D&D 5e group just leveled up to lvl 5 last night and I play a Human Barbarian in that game. To build the ultimate melee beast do you think I should stay Barbarian all the way or do you think it would be advantageous at some point to multiclass?
If so, when should I and what should I multiclass into?
Second thing: Even if you do honestly believe the campaign will last to 20, don't base your build on being awesome at level 20. Limping through 95% of the game in order to rock the last 5% is silly. I'd recommend against any build that requires more than 1-2 levels of "suckage" before the payoff. It's simply too high a price for too uncertain a reward.
It's not a bad idea to go into fighter, but do it for the immediate benefits: Fighting style right away, Action Surge at level 2, martial archetype at 3, feat at 4. The Champion is worth some thought if you're a half-orc (that expanded crit range plus the half-orc's ability is pretty nice, and Brutal Critical later on), but after thinking about it I'm going to agree with the recommendation of Battlemaster for accuracy.
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