MMO Bosses
Souls Covenants
Fighting Game Supers
Pokemon Gym Leaders
Leaders in Civ by bonuses
100

This boss was considered to be impossible given the amount of damage characters could do at this point of the game, thus generating the meme "mathematically impossible"

C'Thun - World of Warcraft

100

Players are required to have 25 faith to join this iconic covenant

Warriors of the Sun

100

Metsu Hadoken

Ryu (Street Figter)

100

Grass Gym Leader - Kanto

Erika

100

Serenissima - Cannot gain settlers nor annex cities. Double the normal number of Trade Routes available. A Merchant of Venice appears after researching Optics. May purchase in puppeted cities.

Enrico Dandolo - Venice (Civ 5)

200

To dodge the grubs on this boss, you need to dodge as his hand hits the peak of its height

Giganticus Lupicus - Guild Wars 2

200

This may be the first covenant players discover in Dark Souls 1

Blue Sentinels

200

Iceberg

Ice Climbers - Smash Bros

200

Flying Gym Leader - Johto

Falkner

200

Bushido - Units fight at full health even when damaged

Oda Nobunaga - Japan (Civ 5)

300

This boss held the record for highest level for 1077 consecutive days

TzTok Jad - Old School Runescape

300

Players join this cat covenant by putting on a ring allowing them to invade players in the forest

Forest Hunter

300

Rolling Death Cradle

King - Tekken
300

Electric Gym Leader - Sinnoh

Volkner

300

Satyagraha - +5  Faith for each met civilization (including ______) that has founded a Religion and is not at war. Enemies receive double war weariness from fighting against Gandhi.

Gandhi - India (Civ 6)

400

This boss led to the creation of the term "Limit Cut"

Cruise Chaser (Alexander 11 Savage) - FFXIV

400

This covenant allows players to summon harder enemies into other players worlds

Gravelord Servants

400

Shun Goku Satsu

Akuma (Street Fighter)

400

Normal Gym Leader - Scarlet and Violet

Larry

400

Great Warpath - Units move through Forest and Jungle in friendly territory as if they were Roads. These tiles can be used to establish City Connections upon researching The Wheel. Caravans move along Forest and Jungle as if they were Roads. 

Hiawatha - Iroquois (Civ 5)

500

This boss launched with countless bugs and unenjoyable mechanics due to rushed development in the COVID-19 Pandemic, causing Dratnos to say he wanted the computers with the fight data launched into the sun

Stone Legion Generals - World of Warcraft

500

This covenant requires players to not meet Frampt until after they have defeated the Four Kings

Darkwraiths

500

Down with the System

Goldlewis Dickinson (GGST)

500

Fire Gym Leader - Sword and Shield

Kabu

500

The Last Best West - Can build Farms on Tundra tiles, and on Tundra Hills tiles with Civil Engineering. Snow, Snow Hills, Tundra Hills, and Tundra tiles cost 50% less Gold to purchase. On those tiles, resources accumulate twice as fast, Mines and Lumber Mills receive +2 Production, and Camps and Farms receive +2 Food. 

Wilfred Laurier - Canada (Civ 6)