Arynn, suspecting perhaps an undead, leans to beside the stone plates and knocks a quick pattern, hoping an intelligent person will knock back in kind.

When you knock, a returning knock sounds on the other side of the plate and the other ones begin to emit even more rustling sounds.

"What, uh... What are you doing?" Alan says uneasily.

"Huh... I've never known a zombie or skeleton to knock back. Knock once for yes and twice for no. Are you Andrew? Are you hiding from undead in this tomb?" Fargrim waits between each question for an answer. His hand grips his battleaxe, expecting an imminent attack.

I'm playing a show tonight, so in case it's necessary, here's my initiative to speed things along: 11

The hear two knocks in response to the first question a pause and then 2 knocks for the second question. As the second response fades one of the other plates begins to crack from a force behind it and then it crumbles and a dark form slips from the small chamber hidden behind the plate.

Everyone in the Crypt give me a perception check.

Perception: 9

Perception: 15

Still got my light going BTW.

Solastor, As you look at the figure it stands and there in front of you is your father. He looks worse for the wear and he seems to be trying to talk to you but even though his lips are moving you cannot hear anything coming from his mouth. As you look at him the second chamber breaks and the figure of your mother slips from the chamber and rises up to stand next to your father. The banging increases from the other chamber you were communicating with. 

"Huh... weird place to be hanging out if you aren't hiding from the undead," Fargrim says, scratching his head lightly with the blade of his axe.

Perception: 15

Perception: 15

Solastor is startled by this familiar faces so far from his homeland. He begins to greet them warmly but a cautious instinct kicks in.

"What are you doing so far from home? Why are you hiding in this place of darkness? Prove yourselves true or reveal yourself!"

Solastor's mother holds out her hands in a pleading motion but even with her mouth moving no sound comes forth. Fargrim and Arynn watching this carefully notice that the movements of her mouth fall in line with a cadence that indicates words and when they try to watch the movements carefully it almost looks like she is saying. "I am sorry, I love you. Help us, we are trapped."

Insight check to see if this are some apparitions of my parents or some illusion. 21

(play it however you want. They can either be dead or alive. I will play it however you do)

Tapping into his inherent ability as a cleric and remembering his training Solastor immediately knows this is his actual parents. But something also seems wrong somehow.

 "What has led you to be here instead of at rest? What has trapped you in this foul place?"

They mouth once again but no sound comes forth. If you would like to see what they are saying do a perception check however as they do so the stone plate next to you begins to crack and a look of fear comes across their features. 

Arynn keeps his sword readied. "I think we're disturbing something that doesn't wish to rest." He says, ready to strike at if the oncoming thing is an evil entity of some sort.

Perception: 17

With the look of fear Solastor readies his mace and shines his light upon the opening grave.

Solastor you can see your mother look you in the eye and say... "The dark one. Master of Death. He has returned us with the desire to hurt you. We live you. Our love is the only thing limiting his power over us but we cannot fight it much longer. Free us, please." A pleading look crosses her face just as the crack occurs and it switched to horror. 

How do you respond in the last moments before the trapped "??" Comes from its cell?

"Looks like our new friend has decided to join us,"  Fargrim announces. Unseen by the foe, he readies his axe with both hands to swing the second there's an opportunity.

Attack: 19 Damage: 7 (advantage as an unseen attacker?: 20)