A Dawn of Heroes uses the Vanilla Creature Size bonus/penalty rules, for which:
- Tiny Size gets +2AC and +2AB (size not used on ADOH)
- Small Size gets +1AC and +1AB
- Large Size gets -1AC and -1AB
- Huge Size gets -2AC and -2AB (size only used by some polymorph shapes, like dragons)
Using a skin, it is possible for any character to become small, medium or large, e.g. a demon can re-skin to small.
Large sized characters can wield a two-handed weapon one-handed and equip a shield if their pure (i.e. unadjusted) strength is 20 or above.