Certain subraces allow ingame mechanic changes, you can set your subrace in the player menu, under Settings, Player List Status, Change my subrace.
Aquatic Subraces
When underwater, the following subraces are immune to underwater effects, such as drowning and movement decreases:
- Aquatic Elf
- Lizardfolk
- Marid
- Merfolk
- Mermaid
- Merman
- Morkoth
- Nereid
- Sahuagin
- Sea Elf
- Siren
- Triton
- Water Genasi
Undead Subraces
The following subrces reverse the effect of heal/harm and cure/inflict spells when set to hostile, and are healed by Negative Energy Burst's Area of Effect when in party (or by self):
- Undead
- Ghast
- Ghost
- Ghoul
- Lich
- Mummy
- Skeleton
- Vampire
- Wight
- Wraith
- Zombie