When you gain your first level in a class other than your initial class, you gain only some of new class's starting proficiencies, as shown in the Multiclassing Proficiencies table.
Multiclassing Proficiencies (table)
| Class | Proficiencies Gained |
|---|---|
| Barbarian | Shields, simple weapons, martial weapons |
| Bard | Light armor, one skill of your choice, one musical instrument of your choice |
| Cleric | Light armor, medium armor, shields |
| Druid | Light armor, medium armor, shields (druids will not wear armor or use shields made of metal) |
| Fighter | Light armor, medium armor, shields, simple weapons, martial weapons |
| Monk | Simple weapons, shortswords |
| Paladin | Light armor, medium armor, shields, simple weapons, martial weapons |
| Ranger | Light armor, medium armor, shields, simple weapons, martial weapons, one skill from the class's skill list |
| Rogue | Light armor, one skill from the class's skill list, thieves' tools |
| Sorcerer | - |
| Warlock | Light armor, simple weapons |
| Wizard | - |