This thread is about the rivalries and why they exist, though, not about the role each class has.
As for warlocks studying inside the walls and not collecting anything for themselves... Have you... read the grimoire?
"You try and try and try to explain, but no one ever understands. No one who's not a Warlock. Who hasn't spent a dozen years scouring the ruins for one string of symbols, one clean code, one black talon."
...?
English
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Most Warlocks, even then hunters could just be the scouts who could tell a Warlock the location of places. The few Warlocks who set out for their knowledge are the one of the few.
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Scouts would make sense, given their abilities and how they operate. I'm pretty sure a Warlock would be needed to really decipher what things are worth taking, though.
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Exactly, maybe the hunter is told what to look for, but most likely they find something they assume could be worth studying.
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If that was the case, I can certainly see how the rivalry would arise :P Warlocks: "By the Light, I'm surprised you idiots can even find the earth! What is all of this useless crap?! Hunters: "Woah, you guys are lucky we even went out to get this stuff for you! Show a little respect!" Warlocks: "Respect? Respect for wasting our time? [i]Humanity's[/i] time? Bah, just scout out the area for us and we'll send a proper Warlock to do the searching..." Hunters: "*Sigh roughly and walk away* Nerds in dresses... and these are the only guys who can figure all this complicated stuff out?" Titans: "... Hmph."
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This is the perfect explanation.