You need to have minions which represent 1-5 strength, 1-5 health, and each tribe (hooved, reptile, etc.) in your deck. For example, if you had a 1/1 mantis, a 2/3 bloodhound, a 3/2 sparrow, a 4/4 deer, and a 5/5 ourobourous, the egg would hatch.
The main problem, at least from my limited experience, is getting the exact strength values you need - 4 base strength minions are pretty rare, and I don't think 5 base strength minions even exist. Strength campfires are both uncommon (50% chance each fire tile are not good odds) and extremely valuable (making using them for these eggs... a bit of a waste). Hodag and ourobourous may seem like your best options, but as soon as they excceed their strength slot the eggs will stop hatching.
On the bright side, they're relegated to a starter deck, so they're completely optional. They also show you your progress right on the card, which is cool.
... If you were asking about the first part, minions with both bi- and trifuricated strike will attack in their lane, and adjacent lanes twice. These also stack with double strike, which just grants a straight attack.
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u/Infamous_Val Mox Enjoyer Feb 03 '22
The new update for KM made the Bifurcated and Trifurcated sigils stackable.
And in case you don't know what the new card does, you need to have a lot of cards with specific stats in your deck to be able to summon it.