How was the magic system changed?
The DDO magic system was based on the Unearthed Arcana D&D supplement. Instead of the traditional spell memorization system, where a character learns specific quantities of individual spells, characters now have ‘spell points’ and cast from a limited selection of spells they have prepared. This works very similar to traditional CRPGs. Example: A level 1 Wizard with 18 Intelligence has 140 spell points and can prepare three different spells at a time, out of the seven spells in his spellbook. His level 1 spells each cost 10 spell points to cast, though he can use certain feats to modify the cost in exchange for other benefits.