Sith Master Alternate Spellings: Darth Seddious, Darth Sedius,
Darth Sidias, Darth Sedios, Darth Sideous, Darth Sidius, Darth Sidios,
Darth Sedious, Darth Siddious Darth Sidies

Real Name: Dantius Palpatine

Species Race: Human

Homeworld: Naboo

Former Sith Master: Darth Plagueis

Secret Dark Side Power:

The kyber crystal, forged by the enigmatic and immortal Rodar
Wizards, provided Darth Sidious with the ability to hide the
dark side signature of the Sith Lords from detection by the Jedi
Order and the kyber crystal allowed Sidious to cloud the entire
light side of the Force, which thereby allowed Sidious to greatly
weaken every single Jedi Master, Jedi Knight and Jedi Padawan in
the galaxy.

Honorary, Elected or Imperial Positions:

Senator of Naboo Dantius Palpatine
Supreme Chancellor of the Old Republic Dantius Palpatine
Emperor Palpatine over the Galactic Empire.

When did Darth Sidious become a full Sith Master?

Darth Sidious killed Darth Plagueis in a most horrendous way while
Darth Plagueis was peacefully asleep.

Defeated Darth Plagueis on What Planet: Skaggis

Former Alliance: Darth Sidious had no prior dark side experience
before Darth Plagueis invited Sidious to become the Sith Apprentice.

Sith Apprentices:

Darth Maul
Darth Rage
Darth Tyranus (Count Dooku)
Darth Vader (Anakin Skywalker)

How did Darth Sidious perish?

At the conclusion of Star Wars Episode 6 Return of the Jedi,
the redeemed Anakin Skywalker (more well known as Lord Darth Vader)
threw Darth Sidious into the reactor core of the second death star.
Sidious was instantly consumed by this volatile power source, but the
kyber crystal survived to drift in deep space for countless eons.