Tempest Military Strength

Beginning as a humble goblin village, Tempest expanded rapidly with more and more allies joining the nation, while facing increasingly powerful enemies. As of Volume 12, Tempest has already amassed a formidable military force in preparation against the Eastern Empire's invasion.

Principles
Tempest's military can be thought of as a self-defense force instead of offensive forces. This reflected by how Rimuru decided to wait for the Eastern Empire to attack instead of actively waging offensive war. They believe it to be morally right to decimate any invading forces down to the last men, but they would never kill any civilian or continue killing after the war is declared over.

Tempest's Standing Military:

 * 1) Gobta's First Corps: approximately 12,000 members.
 * 2) Goblin Riders, 100 members. Evolved from the combination of Hobgoblins and Star Wolves. Each individuals are ranked A- and they will serve as captains of this corps.
 * 3) Green Numbers, 12,000 members. They have been split into a host of 4,000 members, comprising three teams. The majority of them are warriors from the many tribes of the Jura Forest. Even so, they are B Rank and are a splendid fighting force.
 * 4) Geld’s Second Corps: approximately 37,000 members.
 * 5) Yellow Numbers, 2,000 members. These are the elite High Orcs serving under Geld in the beginning. Individually they are of B+ rank. They are also able to unite with Geld to become a single shield. Rimuru reorganized them into teams and assigned captains.
 * 6) Orange Numbers, 35,000 members, made of the recently “born” High Orcs and are C-ranked. However, only 15,000 are combat units while 20,000 act as support and Engineer Corps.
 * 7) Gabiru’s Third Corps: approximately 3,000 members.
 * 8) Hiryuu, 100 members. They are Dragonewts that followed Gabiru to Tempest in earlier days. Each individuals are mostly ranked A-, but they could coordinate their attacks extremely well. There are some among them who are surpassing A rank as well. Their trump card is the "Dragon Body" Transformation.
 * 9) Blue Numbers, 3,000 members. Comprised solely of new applicants from the lizardmen. They are only C-ranked but they mount the Wyverns and dominate the airspace. Wyverns are B+ level lesser dragon species acquired with the help of Milim.
 * 10) Benimaru’s Fourth Corps: approximately 30,000 members.
 * 11) Kurenai, 300 members. A group of A- rank ogre led by Gobua that acts as Benimaru’s personal cohort. Their current “level” would match the Knights Templar.
 * 12) Red numbers, approximately 30,000 majins, mostly former subordinates of Clayman. They are mostly of B rank, with a few individuals in the A rank territory. They volunteered to protect Tempest after being treated well as POWs.
 * 13) Souei’s Shadow Squad: approximately 100 members.
 * 14) Shadow Squad, 100 members. This unit specializes in intelligence, espionage, and assassination. Souei has sole and exclusive control over them, and few even know of them.
 * 15) Shion’s personal army: approximately 10,000 members.
 * 16) Yomigaeri, 100 members. This unit of consists of individuals killed during the invasion of the Kingdom of Falmuth and revived by Rimuru, obtaining the skill "Complete Memory" and became nigh-immortal. They have reached B+ Rank and are trained personally by Shion.
 * 17) Shion's fan club, approximately 10,000 members. They are lead by Captain Dagura, Debura, and Ryura. (Rimuru incorrectly believes their numbers to be less than 1000, so his estimate on total troops is 10,000 too low).
 * 18) Diablo's Black Numbers: 711 members.
 * 19) They are 711 Demons ranked A and above, consisting of 4 Primordial demons, their subordinates, and unique individuals. After being summoned, these demons are made to inhabit/possess the homunculi inside capsules developed by Tempest. Although their number are too few to call themselves as a Corps, Rimuru considers them as Tempest's strongest unit.
 * 20) Masayuki's Volunteer Corps: approximately 20,000 members.
 * 21) A group of human residing in Tempest and nearby countries volunteered to protect Tempest. They consist of adventurers, mercenaries and immigrants.

Labyrinth

 * The strongest individuals in the Labyrinth with the combat power of Executives.
 * Guardian of the 90th floor, Nine Head Beast Kumara
 * Guardian of the 80th floor, Insect Kaiser Zegion
 * Floor Boss of the 79th floor, Insect Queen Apito
 * Guardian of the 70th floor, Ghost King Adalman
 * Vanguard of the 70th floor, Death Paladin Albert
 * Guardian of the 60th floor, Gadra
 * Guardian of the 50th floor, Gozurl and Mezurl
 * Dragon Lords
 * Various Dragons captured by Milim evolved into Dragon Lords.
 * Fire Hell Dragon Lord
 * Ice Hell Dragon Lord
 * Lightning Dragon Lord
 * Tremor Dragon Lord
 * Death Dragon
 * Gehennic Dragon Lord