No one should be allowed to queue without a soul stone if applicable.

[ShionRasenka]

Anything past Brayflox should require a job stone to queue in Duty Finder. The quest lines surrounding that and building up to Titan should include the Company of Heroes requiring the player to go get their stone as part of their tests.

YES! This would be a Godsend for new players who may not know that after 30 You have to unlock your job! Maybe add a quest where after the banquet and before you go fight Titan, he tells you about a rumor he's heard about soul crystals, and tells you to go see your class guildmaster to ask about it. From there, you're sent off to get your job soul crystal.