Spell point

Spell Points
The amount of magical energy your character has to expend on spells before he/she needs to rest. As Hit Points are to a character's ability to stay alive, spell points are to a character's ability to cast spells. In other games, the same concept is described as Mana.

Spell Point Costs
The amount of spell points a spell consumes upon being cast is dependent on the level of the spell. The base cost is 10 spell points for a level 1 spell. For every level beyond 1, a spell costs and additional 5 spell points to cast. A level 2 spell would then cost 15 spell points to cast, a level 3 spell would cost 20, and so on.

Base Spell Points per Class
 

In D&D Online, characters have the option to take enhancements that offer increased spell points, beyond what is mentioned above.