Goa'uld

Ability score increase: Your Charisma score increases by two.

Age: You can retain a host .5x years longer than the lifespan of the host. For example, an elf has a life span of 800 years, you could retain that particular host for 1200 years. Your symbiote can live for several thousand years. Because of this you most likely prefer Elf and longer living species for your hosts (though other factors can push you to other races).

Alignment: You always tend toward the evil alignment. A good Goa'uld happens once in a million centuries.

Size: Your size depends on your host. A host can grow about 2 or 1d4 (inches) + the maximum height of its species.

Speed: Because of how effortlessly you can push a host the maximum speed increases by 5 or 1d10 the speed of the host race.

Languages: You can speak the languages of your host as well as Alien Worm (which happens to be a variant of ancient Egyptian)

Host: Beginning a game, you can take any species for host, except for Tieflings and Genasi. Due to there infernal heritage, Goa'uld symbiotes cannot survive long in a Tiefling host. And because of their Geni parent, a Genasi has a brain that is far too wild (though it is possible for Goa'uld to find a way to enter Genasi mind one day). A Goa'uld instantly has the special abilities for the hosts race (note: A Goa'ulds ability score does not increase, unless that race has an ability score to strength or constitution). Also, Goa'ulds retain the memory of their host (so there would be background information on a host as well).

Masters of Deceit: Unless revealed, you get an advantage on bluff checks.

Flashing Eyes: When surprised, when attacked, or when intimidated, you must roll a constitution check. If it fails, then you are revealed as Goa'uld.

Revealed (Natural Evil): When revealed as a Goa'uld you have disadvantage on all positive charisma rolls (when trying to convince someone) and have advantage on all negative charisma rolls (when trying to intimidate or scare someone.

- Almarianknight