Dwarves

The Dwarf player character takes 25% more XP to level, but has the following traits:

Innate Resistance - Magical: Dwarven characters have +4 on saving throws against any magic.
Stoner Heritage: Dwarves easily take note of certain features of stonework: sloping corridors, moving walls, and traps made of stone — in particular, falling blocks, rigged ceilings, and tiny arrow slits designed to release poison gas or darts. They can also identify whether stonework is recent or not. Dwarves have a 1/6 chance to recognize these features even when not actively searching and roll with advantage when they are.

Darkvision: Creatures with darkvision can see in the dark, usually out to 60 ft or so. It's not enough to read by, but is enough for monsters to hunt by. You can detect most creatures and the shape and large feature of rooms.