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Armor check penalty
From DDO wiki
Armor check penalty (ACP) is a penalty to some skills due to the restrictiveness of certain armors and shields.
The following are subject to Armor check penalty:
Armor check penalties from armors and shields stack.
[edit] Non-proficiency penalties
ACPs always apply to your skills. Non-proficiency with an armor or shield causes its Armor check penalty to apply to your attack rolls as well.
[edit] Carrying capacity
Carrying capacity also can cause an Armor check penalty.
- Medium encumbrance causes a -3
- Heavy encumbrance causes a -6
Note that medium encumbrance does not give any visual feedback, except that you run slightly slower. This may lead to unexpected deaths while swimming.
