Changes to OSRIC 3.0 from AD&D
A list of changes from OSRIC 2.0 to 3.0 can also be found here:My list based on potential at-the-table differences:
OSRIC 3 noted as O3
Ability Scores
- Intelligent has no reference to minimum spells known.
Classes and Equipment
- Fighters are presented (optionally) with the UA optional rule of Specialization.
- Experience tables differ slightly. (ex. A fighter only needs 17,000 XP to get to level 5 instead of 18,001)
- Classes gain weapon proficiencies in O3 at a rate different than AD&D. (For example, clerics get their 3rd at level 5 in AD&D, 4 in O3).
- Differences in ability score headers (minor and major tests of strength).
- Elves, Gnomes and Dwarves could only be NPC clerics in AD&D, but now can be PCs.
- Half-orcs are capped at level 15 for assassin and level 7 for thieves.
- Assassins get -3 non-proficiency with weapons instead of -2.
- Assassination percentiles are formulaically much higher than the AD&D chart.
- No psionics or bard classes.
- Certain details of the weapons table (ex. crossbows do more damage and "pole arm").
- Details of the thief's skills progression are different.
- No weapons vs. ac type.
- No weapon speed factor.
Combat
- Charging is stated to happen after the charge terminates on initiative roll in O3. In AD&D, initiative it not checked at the melee at the end of a change.
- Damage in O3 taken by an unconscious character aside from bleeding is instantly killed.
Spells
- Some spells have been renamed.
- OSRIC specifically allows spells learned to be 'dropped' to learn a different spell.
- The Fly spell in the AD&D is 1 Turn/level + 1-6 turns. O3 is 6 Turns/MU Level + 1d6 Turns.
- Wall of Ice in O3 is definitely 10 feet thick, rather than AD&Ds common interpretation of non-map unit inches.
Monsters and Magic Items
- Some creatures and items have been renamed or removed ( ex. No Mind Flayer or Eye of Vecna).
- O3 does not list item XP values.

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