In the process of statting up a character from a particular game, I decided that I needed to create a new cosmic ability just to simulate said character's signature ability, a cosmic version of Transmortality with a fatal flaw. You see, at one point in the game, the main characters went out to challenge a particular intermediate deity-level human. This human was akin to a phoenix, in that she possessed fire-based powers, and each time she perished, she was instantly revived back to full health. After being slain 11 times though, she yielded, because her body was so worn-out that she would presumably be knocked unconscious after being killed the 12th time. In other words, she would still revive after being killed in this unconscious state, although she would of course be knocked out all the while, and it would take a few days for her to regain consciousness. No, it can't be Cosmic String, because Cosmic String does not work that way, and the character is known to be unkillable even by more powerful beings.
So, here's the cosmic ability I came up with:
Cosmic Ability: COSMIC REVIVAL (EX)
You can push your body and soul to overcome your own destruction, although not without a cost.
Prerequisites: Con 70.
Benefit: Any time your manifestation is destroyed, you instantly revive with full hit points and no level loss, and you resume your place in the initiative order. However, upon revival, you take special Strength and Dexterity damage equal to 1/X your base Strength and Dexterity scores respectively (not taking into account magic items and artifacts), where X is 1/3rd of your divine rank (round up). This ability damage cannot be prevented by any means, even by immunity to ability damage, although incorporeal creatures ignore the Strength damage.
eg. Thrin the intermediate deity (divine rank 12) has a base Strength of 83 (not counting his Belt of Giant Strength) and a base Dexterity score of 34. Upon revival, he would take unavoidable 21 Strength damage and 9 Dexterity damage.
If both your Strength and Dexterity reach 0 (magic items and artifacts are ignored for this purpose), or if your Dexterity score reaches 0 as an incorporeal creature, you are knocked unconscious and helpless, even if immunities would normally make you unable to be knocked unconscious. You still revive immediately if you are killed in this state, although you do not take further ability damage and you do not regain consciousness.
You regain 1 Strength and 1 Dexterity at the same rate that you would rejuvenate 1 HD (see Table 2-8 on page 24), and once you are back at your original Strength and Dexterity scores, you regain consciousness. If you have Legendary Strength, you regain twice the amount of Strength each time, and if you have Legendary Dexterity, you regain twice the amount of Dexterity each time. The special ability damage cannot be removed by any other means, such as a greater restoration spell, and you cannot regain consciousness by any other means as well.
eg. Thrin the intermediate deity regains 2 Strength per hour thanks to his Legendary Strength, as well as 1 Dexterity per hour. Once Thrin is back at 83 Strength and 34 Dexterity, he regains consciousness.
Special: This cosmic ability may be selected multiple times. Each additional time you take Cosmic Revival, the ability damage is halved (rounded up). In this case, a half of a half is a fourth.
eg. With three copies of Cosmic Revival, Thrin the intermediate deity would only take 6 Strength damage and 3 Dexterity damage on each revival.
I set it up so that this intermediate deity character would need to take three copies of Cosmic Revival in order to have roughly 12 "lives" before being knocked unconscious. Do you think it's a fairly balanced cosmic ability? Or would it be better if X were instead equal to your divine rank, 1/2 your divine rank, 1/3rd your divine rank, or 1/4th your divine rank? Which would be the most balanced?