Spell Damage Increase
Spell Damage Increase (SDI) is an item property that, surprisingly, increases the damage of most magical attacks that are cast. The property is capped at 15% for PvP. For PvE there is no cap on spell damage, so pack it on.
There is no formula needed for Spell Damage Increase because it is a true conversion, a 10% increase means your spell damage is increased 10% and so on. The intensity range of the Spell Damage Increase item property is 1% to 12% for found rings and bracelets. The apparent maximum is 30% for special items (e.g., War of Shadows Invasion Spellbooks).
Qualifiers
As with most code over time, Spell Damage Increase is not as straight-forward as it seems. It does affect Poison Strike and Wither, but it does not affect Pain Spike or Holy Light. It appears that it works with Word of Death, as the spell is not dependant on a secondary ability check like Pain Spike, which involves Spirit Speak, or Holy Light, which involves Karma. SDI impact of WoD needs to be confirmed.
Calculating Spell Damage
- A character's skill level of evaluating intelligence is the first thing that comes into play in calculating the base spell damage. The formula for how much spell damage your getting from your Evaluating Intelligence is this: ((evaluating intelligence * 3) / 100) + 1
- The next factor involved in spell damage is intelligence. The formula for this is 1% spell damage increase for every 10 points of intelligence, or (intelligence / 10) and drop the decimals.
- The next factor is the inscription Skill bonus. This bonus only takes effect when a character has achieved the level of Grandmaster or higher in Inscription. This is a 10% increase in the base damage for Magery Spells.
- And finally, factor in any SDI imparted from items.
SDI Items
Both rings and bracelets can possess SDI.
Weapons
- Breath of the Dead 5%
- Grim Reaper's Scythe 5%
- Rune Blade of Knowledge 5% (fixed stat, runics may have higher amounts)
- Staff of Power 5%
Armor/Neckware
- Elven Leafweave 15% (total from 4 pieces)
- Greymist Armor 8% (2% per from 4 pieces)
- Hat of the Magi 10%
- Kasa of the Raj-In 12%
- Midnight Bracers 10%
- Pendant of the Magi 5%
- Spell Woven Britches 10%
Books
- Conjurer's Grimoire 15%
- Mage Inscribed Spellbooks up to 9% (?)
- Scrapper's Compendium 25%
- Tome of Lost Knowledge 15%
- War of Shadows Invasion Spellbooks up to 30%
Rings
- Crystalline Ring 20%
- Ecru Citrine Ring (random, max seen 8%)
Maximum Possible SDI
As of December of 2008, the maximum Spell Damage Increase is 99%, which is constituted from the following:
- Spell Woven Britches 10%,
- Crystaline Ring 20%,
- any Bracelet with 12%,
- Kasa of the Rajin 12%,
- Midnight Bracers 10%,
- Pendant of the Magi 5%, and
- a maximum War of Shadows Magery Spellbook 30.