Wait for these dragons to grow up because they need to be adults in order to compete in the Coliseum.
Do not sell or exalt any of them in the meantime. Once they are adults, they will be forced to battle in order to determine who carries on the legacy -- and yes, this includes the dragons that made no genetic progress!
Some general rules for these scenarios are as follows:
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1. You must keep a battle streak going,
even if your dragons level up between fights. This is to prevent you from inputting points into areas that would allow one contender to be more likely to succeed over another.
2. You cannot use any sort of potion or spell on your contenders to heal them or boost their stats temporarily.
3. You cannot alter the contenders' starting battle stones.
4. When a contender faints,
they are considered defeated or dead, and thus disqualified from being your heir.
5. For most of these scenarios, a third level-one dragon may join in at least one battle streak. This will be called a "coach," and if they faint, it has no effect on what happens. You may also alter their battle stones beforehand, if you so wish.
This is optional, as you can go into a battle with less than three dragons, but recommended to extend the drama.
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Now, depending on how many hatchlings your nest had, here is how the battles will occur...
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2 Eggs
1. Send both of the contenders (and the coach, if using one) to the Training Fields. Begin your battle streak. If you use a coach and they faint first, keep going; they have no effect on the final outcome.
2. Keep going until one of the contenders faints! The survivor will carry on the legacy.
3 Eggs
1. Send all three of the contenders into the Training Fields. Begin your battle streak.
2. When one of the contenders faints,
keep going. They may look alive, but they have been officially disqualified.
3. When another contender faints, you may stop! The survivor will carry on the legacy.
4 Eggs
1. Send the first two contenders
by birth order (hatchlings 1 and 2) into the Training Fields (with a coach, if using). Begin your battle streak. If you use a coach and they faint first, keep going; they have no effect on the final outcome.
2. Keep going until one of them faints. Set aside the survivor for now.
3. Repeat step one, but with the final two contenders
by birth order (hatchlings 3 and 4). If you used a coach for the first round, you may either re-use the same one or pick a new one.
4. Keep going until one of them faints. Set aside the survivor for now.
5. Take the victors of the first two battle streaks into a new streak (with whichever coach you prefer or a fresh one, if desired).
You can only give a coach stat points before this final round!
6. Commence the final battle streak with the winners from the first two and keep going until one of them faints. The survivor will carry on the legacy.
5 Eggs
1. Flip a coin. If it lands on heads, then the middle hatchling (3) will be in a trio with the first two hatchlings (1 and 2). If it lands on tails, then the middle hatchling will be in a trio with the last two hatchlings (4 and 5).
2. Whether the trio goes first or the duo and the coach go first depends on which group the middle hatchling ended up in. If the coin landed on heads, then the trio goes first; if it landed on tails, then the duo goes first. Either way,
the group with the first two hatchlings in it goes first.
3. Perform the battles in each group as follows:
- For the trio group, take the three contenders to the Training Fields and begin a battle streak. Like with the 3-egg nest, the first fainter isn't ushered out between streaks; though they will appear alive, they are disqualified upon fainting. Keep going until a second dragon faints. Set aside the survivor for now.
- For the duo group, take the two contenders (and a coach, optionally) to the Training Fields and begin a battle streak. Like with all battles that may have a coach, whether they faint or not doesn't matter. Keep going until one of the contenders faints. Set aside the survivor for now.
4. Once the two survivors in each trial have been selected, bring them (and the coach from the duo group, if applicable) to the Training Fields once more. Begin your final battle streak and keep going until one of the contenders faints. The other one is the sole survivor and will carry on the legacy.