Basic spellcasting is a normally in nwn2 with the following notes.
Note that there is no Arcane spell failure for casting in armor, but all spellcasters can suffer from extraordinary spell failure if they cast spells in too heavy armor.
The base extraordinary probability comes from the armor type and is modified by the class of the caster and by the spellcraft skill of the caster. Also casting the spell stilled or silnt modifies.
A failied extraordinry spell failure roll often results in chaotic effect very much like ritual failures do.
| Armor type | Base ESF |
|---|---|
| Quilted armor | 0% |
| Leather vest | 5% |
| Leather coat | 10% |
| Long leather coat | 10% |
| Chain vest | 20% |
| Chainmail | 30% |
| Chain hauberk | 40% |
| Breastplate | 20% |
| Half plate | 40% |
| Full plate | 50% |
This gives you the basic probability for extraordinary spell failure that is then modified.
| Spellcast class | Base reduction | Reduction class levels |
|---|---|---|
| Bard | -20% | Bard |
| Cleric | -30% | Cleric, War Priest |
| Druid | -0% | Druid |
| Paladin | -40% | Paladin |
| Ranger | -10% | Ranger |
| Sorceror | -0% | Sorceror, 2*Eldrich knight |
| Warlock | -20% | Warlock |
| Wizard | -0% | Wizard, 2*Eldrich knight |
Spellcast class: this the the class that you cast the spell as.
Base reduction: this is the basic reduction that is allways done based on the class.
Reduction class levels: Each level of these classed that you have reduces the esf by 1, or if there is a 2* then by 2.
| Modifier | Effect |
|---|---|
| Spell cast stilled | Base ESF divided by 2 before other modifiers |
| Spell cast silent | Base ESF divided by 2 before other modifiers |
| Encumberance state of caster | +5% for partial emcumberance, +10% for full encumberance |
| Spell craft skill | -Spellcraft skill% |
All these are cumulative