I am not sure if I am just insane, because everywhere I look online it seems like people are saying Tomb Kings don't get enough heroes in vanilla, and I am not sure if SFO adds more hero capacity for TK or if this is just a vanilla thing, but whenever I play TK it feels like it is really easy to end up with like 30+ heroes really quickly by just taking the various techs and lord skills that add hero capacity. I usually only embed one hero in an army, so I end up with just a ridiculous amount of heroes that don't cost any upkeep (because Tomb Kings) just roaming around (and this is without even really trying to focus on those techs/skills, just picking them up as I go along those trees).