An update for RiiNagaja's "Perks for Warriors of the North" (see here), which itself was based on the "More Perks" and "All Perks" mods.

Installation:
Simply place the .zip into the Battle Brothers/data/ folder. (where your other mods go).

Compatibility:
This mod should not conflict with most other mods. Legends is an exception, since it replaces the entire perk tree.
Does not rely on mod hooks.

This mod works by simply appending the new perks to the perk tree and rebuilding the internal perk LookupMap. (Open the x_more_perks.nut file to see how it works).

Effects:
Perk effects copied over from RiiNagaja's mod:

Battle Flow: Once per turn, killing an opponent reduces current fatigue by -15% of the base maximum fatigue (before penalties due to armor are applied).
Bloody Harvest: Gain +10% chance to hit for all area of effect attacks.
Devastating Strikes: All damage inflicted is increased by +10% for any weapon used. ("More Perks" mentioned this to be 10%, but the original vanilla game script used 20%, which had to be corrected due to balance reasons.)
Full Force: Gain +5% of your current body armor as additional maximum damage when attacking with melee attacks.
Inspiring Presence: Allies of the character start every battle at confident morale unless prohibited by character traits.
Lookout: Vision is increased by +1.
Battering Ram: Immunity against being stunned.
Double Strike: After landing a hit, the next attack does +20% damage to both hitpoints and armor. If the attack misses, the effect is wasted.
Feint: If an attack misses, it costs -50% less fatigue than normal. (I boosted this way up from -20%. Might be too much. Comments welcome.)
Last Stand: Gain +1% additional Melee and Ranged Defense for every 1% of hitpoints missing.
Rebound: Fatigue regeneration is increased by +5 per turn.
Return Favor: Unlocks the "Return Favor" skill which when active has a 50% chance to stun any opponent missing a melee attack against this character in retaliation. Immunities and resistances against being stunned still apply.
Sprint: Unlocks the "Sprint" skill which allows for sprinting over short distances in straight lines instantly.
Stalwart: Immunity against being knocked back or pulled up close. Applies to skills such as Knock Back, Hook and others that change a character's position.
Steadfast: Getting hit by regular attacks does not cause a loss of fatigue anymore. Attacks that specifically target fatigue are unaffected.
Sundering Strikes: Effectiveness vs. Armor is increased by +20% for any weapon used.
Vengeance: On being hit, receive +20% damage to your next attack. The effect will be wasted on a miss.