I am searching for signs of what killed them.
Your Heal check is a success. Though their soft tissue is lost to the ages, their skeletal remains have much to tell. Both figures have fractures of their shield arms. Both figures have lacerations (likely claws) and punctures (likely fangs) that would have torn through their soft tissue and impacted the bones beneath; thigh, weapon arm, exposed collarbone where armor is torn.
The figure on the ground has a grave head wound in the form of a depressed skull fracture. He must have died of his wounds where he now lies; in the lap of his companion.
The seated figure has some of the same injuries but appears to have fared better. He couldn't have died from his visible wounds. He does, however, have multiple bites that have punctured to the bone. A nearby dagger appears spilled from his hand in self-sacrifice.
After my analysis of their bodies, I will examine the archaic language and hope that it will fill in any missing pieces that are missing from my examination of the body.
Your History check is successful at the Hard DC. The language is old in the extreme. It is a dead form of common that you know was spoken several millennia ago. You can make it out more or less word for word:
“The Gods left us in an age long before this time. May this once holy place be consecrated in the blood of noble warriors who were unable to stem the tide of the Moon Madness, but refused to stand down when the Lord of All Beasts and his masses washed over them. Our spirits will remain silent sentinels, our vigils neverending.”
This may send a cold shiver down the spines of some, but you're sure these spirits are vengeful only against those you might call enemy.
I am looking for anything that could be a sign of danger, such as recent animal tracks. I also want to ensure that the entrance I came in is the only point of egress. For benefits, I am looking for any fresh edible plants that could be growing in the caves and water streams.
Your Perception check is successful at the Hard DC. There are no other points of egress. The natural chimney for the firepit is barely more than a few cracks. The scant, and well hidden, opening bottlenecks any would-be intruders. The reservoir and tributaries are abundant with fish and fresh water. The ample foliage obscures the cave from all but the most perceptive observers. There is plenty of fuel to keep a fire going for as long as is required to maintain warmth or keep animal predators away.
The still-viscous silver in the crucible is Alchemical Silver. Should you choose to place it in a stoppered vial/container, there is enough for two uses (@ 50 GP apiece):
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Alchemical Silver
This shimmering liquid clings to a weapon, giving it the appearance of brightly polished silver
[TABLE="class: magicitem"] [TR] [/TR] [TR] [TD="class: mic1"]
[/TD] [TD="class: mic2"]
[/TD] [TD="class: mic3"]
[/TD] [TD]
[/TD] [TD]
[/TD] [TD]
[/TD] [TD]
[/TD] [/TR] [/TABLE] Power
Consumable (Standard Action)
Your weapon or one group of ammunition (30 arrows, 10 crossbow bolts, 20 sling bullets, or 5 shuriken) attacks as a silvered weapon until the end of the encounter or for the next 5 minutes. Alchemical silver can be applied to nonmagical weapons and to magic weapons of 14th level or lower.
[/sblock]
The scroll is a Ritual Scroll of
Earthen Ramparts and is written in the same lost language as the scrawlings on the wall.
Your Complexity 1 Skill Challenge is successful (4:0). The History check and the Perception checks would either be sufficient to close out your conflict in the affirmative, confirming that this is as well-guarded, hospitable, and defensible a location as you will find for the children.
Let me know how you wish to proceed.