To weaken the Sel Mahum, you have to disrupt their training in every way. Take the Salmon from the Sel Mahum Chef so the Sel Mahum can't train, or pull the laces out of the boots of those who aren't training to keep them from fighting.
Hunting targets: Sel Mahum Chef, Sel Mahum Recruits, Sel Mahum Soldiers
Mission Complete
Target: Guard Stan
Looks like the Sel Mahum will pose a threat to no one but themselves. Go back to the Guard Stan of Oren Village.
Basic Comforts
Target: Sel Mahum Training Grounds
Stan theorizes that the way to defeat the Sel Mahum is take away their basic comforts. Extort salmons from Sel Mahum Chef and steal the shoelaces from Sel Mahum Soldiers so that their training goes awry.
Monsters to be hunted - Sel Mahum Chef, Sel Mahum Recruit, Sel Mahum Soldier
Mission Complete
Target: Guard Stan
Looks like the Sel Mahum will pose a threat to no one but themselves. Go back to the Guard Stan of Oren Village.
Talk to GuardStan in Town of Oren. He thinks the Sel Mahum are very dangerous, so their fighting capacity has to be undermined urgently. Be ruthless with them: take the tasty salmon from the cooks (you can't fight much on an empty stomach), pull the laces out of their boots while no one is looking, in short, rob the caravans, and be utterly merciless.
224784 
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in Town of Oren 
. He thinks the Sel Mahum are very dangerous, so their fighting capacity has to be undermined urgently. Be ruthless with them: take the tasty salmon from the cooks (you can't fight much on an empty stomach), pull the laces out of their boots while no one is looking, in short, rob the caravans, and be utterly merciless. 
10 Shoes String of Sel Mahum and 
5 Shiny Salmon. 
