During the unveiling of third-edition Dungeons & Dragons, I saw a member of the design team say multiclassing offered tempting options for every character, but that every class offered enough rewards to make the choice to multiclass tough. Ideally, D&D multiclassing strikes that balance. In play, third edition fell short of balancing multiclassing. Classes tended to stack extra features at level 1 and sometimes suffered “dead levels” offering few benefits, so multiclass characters tended to outshine their single-class peers.
In fifth edtion, multiclassing isn’t so optimal. The first level of an additional class delivers fewer proficiencies. Every class level delivers new features or at least more spell slots. So while each class brings goodies, characters that multiclass lose some advantages of focus.
Spellcasters pay the biggest price for multiclassing. The top level in each separate spellcasting class limits the highest level of spell a character can know or prepare, so every level of a multiclass slows progress to higher-level spells. Characters reach spell slots based on the sum of their spellcasting classes, so they may gain slots of a higher level than any spell they know. At most, they can use those slots to boost a lower-level spell. Spellcasters who veer from their main class for more than 3 levels will never gain 9th-level spells.
Most classes leap in power at 5th level. Barbarians, fighters, paladins, and rangers all get a second attack. Wizards and sorcerers gain Fireball. Bards and warlocks gain Hypnotic Pattern. Monks gain Stunning Strike. When single-class characters reach level 5, multiclass characters will fall behind until their main class hits level 5.
At level 4, every class delivers a +2 ability score boost. Until a character’s attack or spellcasting ability reaches 20, these ability boosts stand to improve almost every to-hit roll and to hinder every foes’ save. Multiclassers who stop leveling a class at 1, 2, or 3 miss a key upgrade.
Despite the offsetting drawbacks of multiclassing, just a level or two of a class can enrich a character. For some players, multiclassing yields the flexibility to match a character’s story concept. Other players just want power. Many players seek a unique concept.
Whatever your aim for your character, this list reveals the top 7 classes to add as a multiclass.
Generally, barbarian makes a poor second class. Few martial characters want to avoid armor. Spellcasters can’t cast while raging. Despite the limitations, 2 levels of barbarian make a gimmicky combination with rogue. The Reckless Attack feature lets your rogue gain advantage for Sneak Attack.
For spellcasters aiming to become much more durable, two cleric domains make a good start.
A character who starts as a Tempest cleric gains heavy armor proficiency. At 2nd level, the domain grants Destructive Wrath, which lets a cleric use Channel Divinity to deliver maximum lighting or thunder damage. Most spellcasters can find use a for that.
The Forge domain also grants new clerics heavy armor proficiency. At 1st level, these clerics can use Blessing of the Forge to add a +1 bonus to your armor or to a martial party member’s weapon.
Update: In the comments, Rooneg raises an important point. Heavy armor demands Strength scores higher than any spellcaster needs, so most characters only benefit from the medium armor proficiency granted by every cleric domain.
Unlike other classes that grant armor proficiency, a level of cleric keeps spellcasters on pace as they gain spell slots. As a drawback, your spellcaster will gain little benefit from the 13 Wisdom required to multiclass as a cleric.
At first level, bard delivers light armor proficiency, a skill, and Bardic Inspiration. Most multiclassers continue to gain Jack of All Trades at level 2. This adds half your proficiency bonus to every ability check where you lack proficiency.
Levels of bard combine easily with charisma-based spellcasters.
Characters dip into warlock for 2 levels to gain 2 Eldritch Invocations. For charisma-based casters, the Agonizing Blast invocation upgrades Eldritch Blast from an ordinary, weak, cantrip attack to a powerful option. Devils Sight makes a dangerous combination with the Darkness spell. Mask of Many Faces lets a deceptive character scheme past obstacles and break a few adventures. Ignore the shell-shocked look on your dungeon master’s face; they love it.
When you calculate a multiclass spellcaster’s spell slots, Warlock levels don’t add to other caster levels. Still the warlock class combines especially well with sorcerer. See 7 Dungeons & Dragons character builds absurdly good at one thing.
Many of the Sorcerous Origins bring appealing perks at level 1. The Divine Soul’s Favored By The Gods feature lets you add 2d4 to a failed save. I like mobile characters, so the Storm Sorcerer’s Tempestuous Magic strikes my fancy. Before or after casting a spell, the feature lets you fly 10 feet without provoking.
Multiclassers add sorcerer to gain the 2 metamagic options available at level 3. Quickened Spell, Twined Spell, and Heightened Spell may rank as the best. Subtle Spell helps in adventures that feature role play and intrigue.
Characters rising in other spellcasting classes can trade spell slots for the sorcery points that fuel metamagic options. Except in the sort of dungeon crawls that exhaust spell slots, most mid- to high-level casters rarely use all their slots anyway.
The first level of fighter ranks as the most useful single level in fifth edition. Characters who start as fighters gain heavy armor proficiency.
Level 1 also delivers a fighting style. The Archery style brings a +2 to ranged weapon attacks and benefits every sharpshooter. The Defense style grants +1 AC and keeps your spellcaster from harm. The Protection style helps save your allies. Protection lets a shield-bearing character impose disadvantage on an attack against a character within 5 feet. First-level fighters also gain Second Wind.
Levels 2 and 3 bring fewer rewards, but the features suit players who enjoy bringing big damage spikes. At 2nd, Action Surge lets fighter take an extra action once between rests. At 3rd, the Champion archetype scores critical hits on a roll of 19 or 20. This combines brilliantly with the paladin’s Divine Smite feature. If you stick with fighter through level 3, you should probably stay with the class to level 5 for the ability score boost and the Extra Attack feature.
At 1st level, the Rogue class delivers Sneak Attack, but the Expertise feature may benefit dabblers more. Expertise doubles your proficiency in two skills. Second level brings Cunning Action, the best prize for multiclassers. Use a bonus action to Dash, Disengage, or Hide.
As a bonus, characters who start as a rogue gain 4 skills while most other classes just get 2.
A level or two of rogue fits with most multiclass characters.