Auto-translated
Weakening Strike is not very useful for Orcs, as it's impossible to raise the attack penalty above -3. In general, investing in skills like Diminishing Darkness or Chaos, if the enemy doesn't develop those magic skills, seems pointless, even if it's just for the good abilities they offer. Attack, Logistics, Defense, Luck, and Battle Cry also have good abilities, and the skills themselves are more useful.