Swamp Elf (5e Subrace)
From D&D Wiki
In some worlds, elves are being driven from the main locations of civilization. With the world becoming more civilized, as well as having so many other options shut off to them, some elves have retreated to places such as swamps, and have evolved and adapted to the special way of life they must adopt. Swamp elves tend to be a bit hardier than their cousins.
Ability Score Increase. Your Constitution score increases by 1
Resistance of the Wetlands. Your time in the swamp has made you more resistant to diseases. You have advantage on saving throws against diseases.
Mask of the Wild. You can attempt to hide even when you are only lightly obscured by foliage, heavy rain, falling snow, mist, and other natural phenomena.
Wetlands Traveler. When traveling through difficult terrain during a heavy rain or when in wetlands, your movement speed takes no penalty, and you can move at a steady pace without slowing.
Cantrip. You have a natural talent after growing up in the wilderness, and have picked up some small knowledge of nature magic. Choose one cantrip from the druid spell list. Wisdom is your spellcasting ability for it.