Each heroic character level in DDO is divided into 5 ranks. (Epic levels do not include ranks, though epic destiny levels do.)
When completing the first four ranks in each level (for example, completing ranks 1, 2, 3 and 4 en route to earning level 2 with the completion of rank 5), characters receive an action point which may be spent at a class trainer to gain or exchange enhancements. When the fifth rank in each set is completed, the character gains a level. So, a starting character completes ranks 1 through 4 and gains an action point for each. Then, once rank 5 is complete, the character can level up and enters rank six.
A player can delay having the character learn their next level and still gain ranks toward the subsequent level, but is not able to use the action points earned until that previous level is learned at a trainer.
Characters start at level 1, rank 1 with 0 XP and gain their first AP once rank 1 is complete.
Heroic rank table
|level 01||rank 01||rank 05||rank 10|
|level 02||rank 06||rank 10||rank 15|
|level 03||rank 11||rank 15||rank 20|
|level 04||rank 16||rank 20||rank 25|
|level 05||rank 21||rank 25||rank 30|
|level 06||rank 26||rank 30||rank 35|
|level 07||rank 31||rank 35||rank 40|
|level 08||rank 36||rank 40||rank 45|
|level 09||rank 41||rank 45||rank 50|
|level 10||rank 46||rank 50||rank 55|
|level 11||rank 51||rank 55||rank 60|
|level 12||rank 56||rank 60||rank 65|
|level 13||rank 61||rank 65||rank 70|
|level 14||rank 66||rank 70||rank 75|
|level 15||rank 71||rank 75||rank 80|
|level 16||rank 76||rank 80||rank 85|
|level 17||rank 81||rank 85||rank 90|
|level 18||rank 86||rank 90||rank 95 (cap)|
|level 19||rank 91||rank 95||rank 94 (cap)|