How about each vestige has a special ability, an 'at-will', an encounter and a daily power.
Binders get one 'at-will' power plus the special ability and 'at-will' power from whatever they declare their 'primary' vestige. (Utility powers are not linked to a vestige.) Paragon Paths can be specific 'Special Vestiges' you are perminently bound to.
Level / # Vestiges
1-2 / 1
3-6 / 2
7+ / 3
All vestiges have a list of three encounter and daily powers depending on their rank, for simplicity they can all be similar to one another:
Vestige Rank : Encounter Powers : Daily Powers
1 : 1/3/7 : 1/5/9
2 : 3/7/13 : 5/9/15
3 : 7/13/17 : 9/15/19
4 : 13/17/23 : 15/17/25
5 : 17/23/27 : 19/25/29
Each day pick your primary Vestige and fill your highest level encounter/daily slots with a power from the list of the slot's level or lower, plus get its at-will and special ability.
Then, where apropriate, pick a secondary vestige for your second highest level slots and a third for your lowest level power slots.
An example is probably in order.... So I'm a level 8 Binder. Without Vestiges I have an At-Will power as well as 6th and 2nd level utility powers.
I have the following slots for my powers...
Encounter 7, 3, 1
Daily 5, 1
My primary vestige will fill the 7th and 5th level slots, as well as grant a second at-will ability and a special ability. I can pick a rank 1 or 2 vestige to get 7th and 5th level powers.
My secondary vestige will fill the 3rd and 1st [daily] slots. I have to pick a rank 1 vestige since rank 2s don't have level 1 powers.
My tertiary vestige will fill the 1st [encounter] slot. I have to pick a rank 1 vestige since rank 2s don't have level 1 powers and I only get the encounter power, not the daily.
Make sense? I may not have explained it well, but it gives you three Vestiges, each with their own unique powers. Seems a close match to the way the old system worked, but in 4e.
Lord Kiwi,