Editing Space Marine Chapter Creation Tables (section)

==Chapter Origins==

{| border="1" cellspacing="0" cellpadding="5" align="center"
! colspan="2" |Why Was The Chapter Founded? (d20)
|- 
! 1-2
| Strategic Prognostication - "Our tarot cards say there's going to be a threat here, maybe. Found a Chapter!"
|-
! 3-4
| Counter - "There are Orks over here! Found a Chapter!" "But it'll take 50 ye-" "Do it!"
|-
! 5-6
| Standing Force - "This area doesn't have any Marines in it. Found a Chapter!"
|-
! style="white-space: nowrap;" | 7-8
| Crusade - "We need people running around and hitting the Imperium's enemies. Found a Chapter!"
|-
! 9-10
| Strategic Prognostication - "Our tarot cards say there's going to be a threat here, maybe. Found a Chapter!"
|-
! 11-12
| Honour and Glory - "We shall honour an existing Chapter's glorious deeds by using their gene-seed to found a new Chapter!"
|-
! 13-15
| Cryptic - "This Chapter's existence is a mystery. Few have the authority to know of its existence, fewer still know why it was founded."
|-
! 16-17
| Chamber Militant - "These guys need more muscle to do their job, found a Chapter!"
|-
! 18-20
| Crusade - "We need people running around and hitting the Imperium's enemies. Found a Chapter!" 
|}
Note that the Chapter may have been founded for a particular threat or campaign and have since come to settle down as a normal standing force, or it may have lost its homeworld and became a crusading Chapter in search of a new one. The aftermath of the Great Rift is a excellent opportunity to clear out the old grudges and shift the status quo of the Chapter, for instance a Chapter that crusaded for thousands of years may have found a world to settle. Chamber Militants should pick what Imperial organization they serve (besides military forces, the Ecclesiarchy, and the Mechanicus) and count that organization as an extra ally.

{| border="1" cellspacing="0" cellpadding="5" align="center"
! colspan="2" |When Was The Chapter Founded? (d100)
|- 
! 1
| Unsupported claim of [[Second Founding]] status, but definitely ancient. You can count this as Third Founding but with major connections to elder Great Crusade and Horus Heresy veterans forming the initial Chapter Council, with possibly some still being alive in Dreadnoughts to this day. Salamanders, Iron Hands, and Raven Guard must treat this as Third Founding due to casualties suffered in the Drop Site Massacre, and Space Wolves must reroll as no chimeric Chapters existed at this time.
|-
! 2
| Late M31; Third Founding. Some Founding members are Great Crusade and Horus Heresy veterans. Salamanders must treat this as Fourth Founding (except if a 1 was rolled first) as they suffered the most loyalist casualties in the Horus Heresy, and Space Wolves must reroll as no chimeric Chapters existed at this time.
|-
!3-10
| Unknown
|-
! 11-15
| 32nd Millennium, War of the Beast and subsequent Fourth Founding.
|-
! 16-20
| 33rd Millennium
|-
! 21-25
| 34th Millennium; 8th Founding (sometime mid-millennium) and 9th Founding (between M34 and M35, earlier Chapters). The Chapters of the 8th Founding were explicitly intended by the High Lords to be more bellicose and violent to scare the populace into line.
|-
! 26-30
| M35; 9th Founding (later Chapters), 10th Founding, 11th Founding, 12th Founding and 13th ("[[Thirteenth Founding|Dark]]") Founding, which is called that since the Imperium lost all data regarding the chapters created at this time, save for the fact that the [[Exorcists]], the [[Death Spectres]] and the Crimson Sabres who went traitor and became the [[Crimson Slaughter]] are from this founding. It may also have spilled over into the 36th Millennium on top of the massive waves in the 35th Millenium.
|-
! 31-40
| M35; 14th-20th Founding <!-- Seriously, there were nine foundings just during M35. [[Derp]]. -->, these foundings were the greatest wave of foundings in history, with an astonishing nine foundings in the same millennium; even excluding the 9th, 10th, 11th, 12th, 13th and the following one the 14th through 20th wave was massive.
|-
! 41-50
| 991.M35; 21st ("[[Cursed Founding|Cursed]]") Founding, this chapter be fucked. This was the individually largest founding of Firstborn Astartes after the 2nd founding, but only handfuls of loyalist Chapters survive. Gene-seed is automatically Flawed.
|-
! 51-55
| 36th Millennium
|-
<!-- let's conveniently ignore the fact that there's only one Founding available between 991.M35 and "early M38". [[Derp]]. -->
! 56-60
| 37th Millennium 
|-
! 61-66
| M38; 23rd ("Sentinel") Founding. Chapters of this founding are more warlike than most due to being founded at a time of increased threats, and are likely to be Fleet based permanent crusaders or settled near protracted danger spots.
|-
! 67-72
| 39th Millennium; 24th Founding
|-
! 73-78
| 40th Millennium; 25th ("Bastion") Founding. Chapters of this founding are more likely to be loose with the Codex Astartes due to the various threats coming to prominence at this time and they are less set in their ways than long existing Chapters.
|-
! 79-84
| 41st Millennium; 26th Founding. This is the last Firstborn founding.
|-
! style="white-space: nowrap;" | 85-100
| M41/M42; [[Ultima Founding]] consisting of [[Primaris Marines]]. Actually in two waves (+ intermittents in-between), first in 999.M41 and 000.M42, intermittent foundings during the intervening years to replace destroyed chapters or garrison key areas, and the second in 012.M42 after the first phase of the [[Indomitus Crusade]] ended with victory at the Battle of Raukos from the last core of [[Unnumbered Sons]] veterans, capping off the largest founding in history. Some members of the Chapter may be Great Crusade, Horus Heresy, or Great Scouring veterans among the first Primaris Marines who were awakened from stasis. Such Veterans assigned to a new Chapter are almost certainly members of the command cadre.
|}
If there's no founding listed in the millennium you rolled, go check which ones are available and pick the closest one to see what they are counted as being from, even if the founding was before or after the official timing. And remember that the Imperium routinely loses planets due to rounding errors, so your chapter not knowing exactly when it was founded is hardly out of step with the lore. For an egregious case, the 22nd Founding is the only one with two entire millenia to itself (assuming the absolute latest Chapters mistakenly labelled as part of the Dark 13th Founding don't count) and it can't even have the previous one got extended and records got muddled excuse as that was the Cursed 21st Founding.


{| border="1" cellspacing="0" cellpadding="5" align="center"
! colspan="2" |Progenitor Chapter Founding (d100)
|- 
! 1-40
| First Founding, this Chapter is directly descended from the First Founding Legion successor or from Gene-seed sourced from the Tithes of multiple chapters of the same Primarch's lineage. Space Wolves must pick this.
|-
! 41-60
| Second or Third Founding, this Chapter is descended from a Successor founded by Great Crusade and Horus Heresy veterans (counts as First Founding or must be Third Founding for Salamanders as they didn't have any early successors).
|-
! 60-75
| Later Founding, this Chapter is a relatively uncommon case of a later Chapter being honored with a writ of succession. Bear in mind that two or three is the usual maximum for all but the most venerable and ancient Chapters.
|-
! 75-100
| Unknown or Redacted Founding, this Chapters predecessors founding date has been lost or redacted. Chapters with unknown or Traitor Legion geneseed must pick this.
|}


{| border="1" cellspacing="0" cellpadding="5" align="center"
! colspan="2" |Progenitor Chapter (if not First Founding, then a successor of that First Founding Chapter) (d100)
|- 
! 1-30
| [[Ultramarines]]
|- 
! 31-45
| [[Dark Angels]] (cannot be from 5th or 6th Foundings)
|-
! 46-55
| [[Imperial Fists]]
|-
! 56–65
| [[Blood Angels]]
|-
! 66-75
| [[Raven Guard]] 
|-
! 76–85
| [[White Scars]]
|-
! 86–90
| [[Iron Hands]]
|-
! 91–95
| [[Salamanders]] (the Salamanders do not recognize any of their successors except the Ultima Founding)
|-
! style="white-space: nowrap;" | 96-99
| Unknown Chapter or [[Traitor Legion Loyalists]] if Second or Third Founding
|-
! 100
| [[Space Wolves]] (must reroll if not chimeric gene-seed or from Ultima Founding)
|-
|}

Due to the Curse of the [[Wulfen]] the Sons of Russ are under a hard limit in canon, though you can do as you wish, possibly justifying by Chimeric gene seed fixing the worst problem at the cost of other issues. Or you can just make an Ultima Founding successor like the [[Wolfspear]]. The Dark Angels can not have any Chapters in the Fifth and Sixth Foundings, as the [[High Lords of Terra]] were explicitly avoiding to make any new ones at this time out of suspicions of Legion building. Decide if Chapter had any units assigned from parent chapter (usually veterans or maybe a whole battle company -reserve companies are unlikely to be separated this way-) as the founding Battle Brothers (for extra fun, you can have some forces go missing for a while and end up culturally isolated and marked down for leaving whenever a Writ of Succession is next granted). If no Brothers were assigned, the Gene Seed tithe reserve will be used (likely with consent of parent Chapter if possible) directly without any further contribution (Dark Angels and Blood Angels will almost certainly send Chaplains to explain the grim realities of the knowledge of the Fallen and the Red Thirst/Black Rage respectively). Also determine if the parent Chapter is a Successor Chapter itself (likely to be more common in later Foundings, except the Ultima Founding). More than any other choice, which Primarch you descend from is dependent on preference. Also note that Traitor Legion Loyalists almost certainly do not know this and if anyone knows it is classified at the highest levels.