Ple-Sen
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In short, possible consequences of helping the mercenaries:
1) New allies
2) Loot from the knights
3) A decrease in reputation with the knights' superiors, unless it leads to outright hostility
4) A questline or (unlikely) money
Possible consequences of helping the knights:
1) Loot from the mercenaries (not guaranteed)
2) A bonus to reputation or even a questline from the knights' superiors
3) The knights try to eliminate us, and potential allies end up dead
Possible consequences of killing both groups:
1) None
2) Don't even think about it
3) I've made my opinion clear
1) New allies
2) Loot from the knights
3) A decrease in reputation with the knights' superiors, unless it leads to outright hostility
4) A questline or (unlikely) money
Possible consequences of helping the knights:
1) Loot from the mercenaries (not guaranteed)
2) A bonus to reputation or even a questline from the knights' superiors
3) The knights try to eliminate us, and potential allies end up dead
Possible consequences of killing both groups:
1) None
2) Don't even think about it
3) I've made my opinion clear