Check who declared war before applying PK and death rules.
A declaring clan needs level 4 and at least 15 members. A one-sided declaration does not make every kill legal: killing a neutral member of a clan that has not returned the declaration can still increase PK count. In a mutual war, killing an opposing member does not increase Karma or PK count.
A member of the declaring clan killed by the opposing clan loses one quarter of normal death XP, even without a return declaration. Academy members do not receive ordinary clan-war treatment.
Before attacking a neutral enemy-clan member, verify whether the opposing clan returned the declaration. The death-XP reduction for the declaring side does not itself make a one-sided war equivalent to mutual-war PK rules.