Intelligence

Intelligence is one of the six basic stats of DDO.

==Intelligence (INT)==

Intelligence determines how well your Player Character learns and reasons. This ability is important for wizards or artificers because it affects how many spell points they have, how hard their spells are to resist, and how powerful their spells can be. It’s also important for any character who wants to have a wide assortment of skills.

You apply your Player Character’s Intelligence modifier to: At first level (character creation) the number of skill points given is equal to ( + Intelligence modifier) * 4. At each further level gained in a class, a character receives a number of skill points equal to + Intelligence modifier (with a minimum of 1 skill point).
 * Disable Device, Repair and Search skill checks. These are the skills that have Intelligence as their key ability.
 * The amount of bonus spell points you gain as a wizard or artificer.
 * The number of skill points gained each level.

Note: Even if your Player Character's race starts with 6 Intelligence (Half-Orc), and your Player Character's class gets 2 base skill points per level (Cleric, Favored Soul, Fighter, Paladin, Sorcerer or Wizard), your Player Character will still get 1 skill point each level.

Chances to raise Intelligence score
You can get raises for your Intelligence score from different sources. Note that some of these changes will influence the number of skill-points that the character will generate at each new level, but most of them will not. The skill point gain is not retrospective, e.g. will function only for the levels then on.

Changes that influence the number of skill points gained
 * Character Creation (maximum starting value of 20/18/16) - During character creation, you can add up to 10 points to your basic Intelligence score, which means a Drow character can start with an Intelligence of up to 20, Dwarf, Elf, Half-Elf, Halfling, Human and Warforged with Intelligence of up to 18 and Half-Orc character with Intelligence of up to 16.
 * Level-ups (maximum raise by 5 points) - On 4th, 8th, 12th, 16th and 20th level you are allowed to raise a single ability by 1 point. If invested to Intelligence and the ability score moves to the even number, the change will raise the number of skill points gained on that level and every level thereafter.
 * Tomes (maximum raise by 4 points at the moment) - Tome of Clear Thought or Supreme Tome of +1-4 will raise the Intelligence score by the appropriate value. If the ability score moves to the next even number or further, the change will raise the number of skill points gained on the next level and every level thereafter (as opposed to the level-up ability raises, tomes are applied after the skill points are assigned for the given level). The maximum raise will be +5, when +5 tomes are added to the game.

Changes that do not influence the number of skill points gained
 * Enhancements - Class enhancements do stack with the Racial enhancements, but not with other Class enhancements
 * Class Enhancements - two classes allow to raise the Intelligence score via enhancements - Wizards (by up to +5) and Artificers (by up to +3). Moreover, a Half-Elf can use his Wizard Dilettante feat to access the Half-Elf Wizard Dilettante line of enhancements that can raise the Intelligence score by +1.
 * Wizard Class Enhancements - +1 to +3
 * Wizard Capstone Enhancement - +2 which actually stacks with Wizard Class Enhancements.
 * Artificer Class Enhancements - +1 to +3
 * Half-Elf Wizard Dilettante - +1
 * Racial Enhancements - two races allow to raise the Intelligence score via enhancements - humans and half-elves, both by +1.
 * Human Racial Enhancements - +1
 * Half-elf Racial Human Enhancements - +1
 * Completionist feat - bonus +2 to all abilities.  Needs confirmation whether it raises skill points or not.  [unverified]
 * Enhancement bonus - items normally come with the bonuses of +1 - +6, some rare Epic items may have a bonus of +7. Only the highest bonus counts. Notable items providing +7 bonus are:
 * Epic Diabolist's Docent - epic version of Diabolist's Docent, item to be gained from The Chronoscope end reward.
 * Epic Diabolist's Robe - epic version of Diabolist's Robe, item to be gained from The Chronoscope end reward.
 * Epic Illusionist's Garb - epic version of Illusionist's Garb, item to be gained from Maleficent Cabal end reward.
 * Epic Staff of Inner Sight - epic version of Staff of Inner Sight, item to be gained from Chains of Flame Library Chest.
 * Exceptional Enhancement bonus - some rare items may come with +1 or +2 Exceptional Intelligence bonus. These bonuses, unlike the Enhancement bonuses, stack if they have different numerical values and also stack with Intelligence Enhancement bonus. Notable items providing +1 or +2 bonuses are:
 * Epic Utility Vest - epic version of Utility Vest, item to be gained as Maleficent Cabal end reward, provides the Exceptional Intelligence +2 bonus.
 * Epic Treasure Hunters Spyglass (Tier 2 and Tier 3) from the Treasure of Crystal Cove event provide the Exceptional Intelligence +2 bonus.
 * Incredible Potential feature of any of the Tower of Despair unique loot rings may be used to upgrade the ring to provide the Exceptional Intelligence +2 bonus.
 * Epic Treasure Hunter's Spyglass (Tier 1) or Treasure Hunter's Spyglass (Level 16)(Tier 3) from the Treasure of Crystal Cove event provide the Exceptional Intelligence +1 bonus.
 * Tempest Rune of Exceptional Intelligence inscribed on the Dragontouched Armor provides the Exceptional Intelligence +1 bonus.
 * Colorless Augment Crystal of Exceptional Intelligence inserted into any epic item augment slot will provide the Exceptional Intelligence +1 bonus.
 * Rahkir's Ring from the Tower of Despair unique loot rings provides the Exceptional Intelligence +1 bonus.
 * Ring of Deftness from the Tower of Despair unique loot rings provides the Exceptional Intelligence +1 bonus.
 * Sanura's Band from the Tower of Despair unique loot rings provides the Exceptional Intelligence +1 bonus.
 * Whisper Ring from the Tower of Despair unique loot rings provides the Exceptional Intelligence +1 bonus.
 * Kormor's Ring from the Tower of Despair unique loot rings may provide the Exceptional Intelligence +1 bonus if equipped and unequipped for sufficiently long time.
 * Artifact bonus - Guild Airship buff shrines for intelligence provide a +1 or +2 artifact bonus that stacks with everything.
 * Profane bonus
 * Litany of the Dead trinket from the Ascension Chamber Warded Chest provides a bonus of +1 to all abilities including Intelligence.
 * Consuming White, Black, Red, Blue and Green Abishai Gingerbread Cookie from the Jester of Festivult event at the same time gives you a +4 profane bonus to Intelligence, Wisdom and Charisma for 10 minutes.
 * Alchemical bonus - Magda Yarrowmill of the House Deneith Ward Collectors will trade some collectables for potions giving a bonus +1 - +3 to the Intelligence score for 2 minutes. The items generated from each set of collectibles are random, so you may end with +X Wisdom, +X Wisdom skills or +X Intelligence skills items instead.
 * Yugo Pot bonus - Yugoloth mercenary potions may add a +2 bonus to any ability for 15 minutes. This bonus stacks with everything.
 * Lich form bonus - this Pale Master enhancement adds +2 bonus to intelligence when in Lich form.  Needs confirmation on type and stacking.  [unverified]

That makes a theoretical maximum for Intelligence 59 for Drow in the lich form under the effect of the best goodies.