Masteria Expansions, Names and the proof for each

What clans? the Raven Clan, the Dragon Clan, etc.?
maybe, but i think the clans are too recent to place something on the graves of Christopher Crimsonheart.
(the text directly on the tombstones are the same, so look at the bottom one.)

or do you mean the numbers? if so, i have no clue.

Pretty sure he meant the groups of Crimsonwood's past, like Stormcasters, Windreavers, bosshunters, etc.

Someone on sleepywood pointed out that the Crimsonwood enemy in the cave, which appears to be a mage girl, has a moon image on her headband:


Since there's a Moon symbol on the Moonstone grave, perhaps this is related? Doesn't look like the other enemy there has a sun marking, though.