(OOC does anyone actually know how to boat really? Also shouldn't there be massive waves from a 30ft titan moving through the water and isn't the only option in a boat is trying to move left or right of the demon lord?)

Kastix is looks at them, shrug and just moves away from the shore altogether. 

Edit: does Sekkar have vehicle(water) profieincy?

((Sekkar is supposed to know, as a fisher, and we were not told about giant waves crashing at the shore. Looks like it's a choice between mad crowds with demon's attention on it and boats closer to demon but with a hope he would prefer kuo-toa))

"We need boats to cross this lake later when things have settled down.  Let's take some, stay close to shore and move away.  It's that or try and get through the walls with everyone else and that demon is headed this way."

When Kaylyn gets close she'll jump into a boat get anyone else of the party into it and head north. 

Yes, Sekkar does have proficiency in water vehicles. It's not shown on the character sheet but it was an adjustment BlueBayou and I agreed to when rolling up the character.

In the initial confusion no-one quite knows which way to flee, but as Sekkar calls out to make for the docks, Kastix starts to shove a path through the mad crowds. Kaylyn follows after, broadening the way where necessary by blasting at the kuo-toa with arcane bolts. Sekkar and Zeno come next, hauling Rhayna's limp body between them, with Joetaro last, guarding their backs and fending off the mob. Not far behind Joetaro though still apparently caught up in the crush, Sarith's head can be seen above the crowd, but he continues to babble and doesn't seem fully aware of his surroundings. There is no sign of Derendil or Jimjar.

As the group approach the docks, they see that many boats have already pushed off from the shore. Although each boat is big enough for at least 4 bodies, many are only occupied by a single kuo-toa, and where more are aboard, they seem to be fighting among themselves. For those tossed in the water, as well that those swimming out toward the boats and trying to clamber aboard or simply swimming in any direction, the blood-stained waters around them continue to churn as some unseen submerged creatures attack and feast upon them.

Forcing their way through to the dockside, they see that only two boats remain, rising and falling on the waves that wash ashore as the demon lunges toward the village, roaring hungrily. One boat has recently been deprived of its kuo-toa occupant by the ten-foot-tall duergar prisoner, and he is quickly preparing for launch with practiced skill. Two kuo-toa are fighting over the second and final boat, and are easily dispatched by bolts of energy and fire from Kaylyn and Kastix. However, Sekkar quickly deduces that the single boat will become swamped if they all attempt to board it...

OOC: A ten-foot-tall duergar?! Impressive!

Lowering Rhayna's body on the ground (and hoping Kaylyn does not need any props to seize the now free boat) Sekkar run to the gigantic duergar (with all intent to jump into the boat and fight for it if he should): "Take some of us with you. You will not regret helping!" (The part "or we will feed you to the lake-monsters" he left out for the moment)

Joetaro motions everyone to the boat. "I can wait here, I don't want the boat to collapse on itself."

Kastix shakes his head while rolling hie eyes before grabbing Joetaro, "Come, we'll run shore while they can play in the water with the titan. We'll bring Rhayna along, Doubt she can swim unconscious," Point across the shore as far as they can see, "We'll meet you somewhere along the way if you can survive," 

Joetaro nods and follows.

Rhayna murmurs repeatedly while unconscious. “Demogorgon, Prince of Demons. Demogorgon, Prince of Demons...”

Map for reference. Red circle indicates current location

Kastix and Joetaro pick up Rhayna and turn to make their way north out of the village, but find a channel of water blocking their way. Dozens of kuo-toa have already attempted to cross, but at least half of them are struggling against the same underwater attackers as those in the Darklake, as are those further north trying to skirt around the wall by passing through the shallows.

The duergar looks up and glares at Sekkar, then scans the group, appraising them impassively. He scowls at Sarith, but does a double-take when he sees the tiefling. Aye then, but make it fast, he says to Sekkar, speaking rapidly in Undercommon. Three only, and not the drow. I'll take yer red friend there, 'is 'elper an' the body they be carrying. The rest o' ye take the other skiff, if'n ye know 'ow. The second boat has been freed from its moorings by Kaylyn, and blank-faced Sarith climbs in and sits up in the bow.

There are fewer kuo-toa nearby, with most already fleeing the area around the shrine, either running deeper into the village, toward the gates or into the water, but about a dozen more kuo-toa approach the docks looking for an escape as the demon lord draws nigh. It is less than 100 feet from the shoreline, and its two hideous heads, which glow with an inner fire, grin wickedly at the scene before it. Then a horrific fiendish voice is heard in everyone's mind, echoing with a hollow emptiness that feels like the bottom has dropped out of the universe:

Flee before me, puny mortals, for heaven and hell doth quake at my coming.

Zeno casts a look at Kastix and Joetaro as they take jRhayna, but seeing them into the boat with the duergar, he umps into the skiff with Sekkar, and looks for something to do to be useful.

Just to clarify...

The village is built on a 'beach' between the eastern shore of the Darklake and some stone cliffs. There is a wall on either side of the village, extending from the cliffs to the water. Escape from the village is possible either 1) through the gate in the wall on either end and then via the beach on foot, 2) wade/swim through the shallows around the wall and then up the beach on foot, 3) via boat on the lake. I made the assumption that the party was fleeing north (towards the right on the map), based partly on post #1610. According to the map, that puts the channel in the path of making it to the edge of the village. From here, making it to the village's northern edge will require either crossing the channel or going around it. The demon lord is within about 100 feet of the shore, and moving at 50 feet per round, so will be there in two rounds.

If any of these assumptions don't fit with your idea of what's happening, let me know and I'm happy to make alterations and retro-fit the actions to match, as long as they are consistent with anything that HAS been explicitly described.

I figured the demon lord was somewhere west of the B in the name of the town on the map so North would be the fastest way away from town. If that is incorrect we certainly don't want to be going towards the demon if it is north or northwest.

Kalyn grabs a paddle and helps Sekkar move the boat along the shore and away from town. 

Sekkar nodded to duegar, joined Kaylin, Zeno and Sarith in another boat and did his best now to steer it away from the demon. Gigantic duegar had to be easy enough to spot, to keep an eye occasionally on the other half of the group. 

Stool was probably still with Zeno, who carried him before (in case duegar was adamant about number of passengers).

The two boats have barely pulled away from the docks when the demon lord lunges toward the village with a deafening roar that seems to make both the rock and the water tremble. Two enormous tentacles fly directly overhead and come crashing down on the rickety towers and bridges just behind the docks with an awful crunch, then immediately sweep back again, sending wood, detritus and even screaming bodies raining down into the water all around the two rocking boats. The demon seems intent on causing as much destruction as possible, and is focused on the heart of the village and the largest mass of kuo-toa crammed at the back closest to the wall, so the boats are able to pull further and further away from danger. All eyes are fixated on the destruction, as the gargantuan tentacles sweep through the village again and again, and it takes no small degree of mental fortitude for those handling the oars to remember to pull on them rather than be distracted by the horror of the scene. By the time Rhayna regains consciousness, the demon and the village are hidden from view by intervening stalagmites jutting from the lake, although the sound of the slaughter and destruction reverberates and echoes across the lake for minute upon endless minute.

Keen to put as much distance as possible between themselves and the rampaging demon lord, the two boats row for close to an hour. Dark shapes move swiftly in the depths below, but all seem to be moving toward the village and none molest the travelers. The duergar in the lead boat reduces himself to normal size soon after departure, and never gets too far ahead, but now gestures toward a small island in the lake with a beach large enough to land. He beaches his small craft, then without any further ceremony leaps onto the firm ground, turns and faces the group with arms folded, and says: Right then, what shall I do with ye now? I'll take ye back to the shore I ye wish, but I'll go nae further north meself.

Sekkar grinned at the dwarf shrinking - smart move indeed, not helping in the boat, may be, but to get to one - it sure was useful. He did not leave the boat more out of sort of politeness - not to intimidate helping hand with his own size. "Shore would help. We would not fit in one boat anyway, and some of us do not trust water."

"We are not so keen to travel north - it's the drow lands, if I my senses don't lie. What we are looking for, is the way up, out of the tunnel, to the surface. Do you know any path leading there?"

Kaylyn looks around sorrowfully. 

"I'm sorry friends, in our panic to flee I believe we went the direction we did not want to go.  We wanted to go south and ended up going north.  Neverlight Grove is southeast of here on the far side of the lake.  The closest settlement is now the svirfneblin city Bligdenstone that Jimjar said access to the surface could be found.  But it will bring us closer to Menzoberrenzan.  The one place we didn't want to go."

She looks to the duerger,

"What is your name?  I am Kaylyn.  Thank you for your help. Can you guide us to Bligdenstone?"

Joetaro nods at Sekkar's words. "My first instinct is to go back to the surface. I'd like to get out of the Underdark, especially out of drow lands."

The duergar speaks much like a dwarf, but without any of the mirth or warmth of that race. His command of Common indicates that he is familiar with the surface world. He is all business, and his offer to take you to the lake shore seems less like a gracious favour and more like a way to rid himself of an inconvenience. But at least he's not marooning you on the island, so perhaps he's not completely heartless. To Kaylyn he replies: I be called Hemeth. I see most o' ye know each other, if not all. I'd say we've 'ad a fair trade. I didnae think I'd 'ave escaped the knife if ye'd not attacked the fish-witch.

To both Kaylyn and Sekkar he replies:
Many paths there be to the surface, not just aroun' Bligdenstone. Most are used by us, er, merchants... tho each likes to keep 'is own secret. Mine is near Gracklstugh, on the sou'west shore o' the Darklake, and that's where I'm 'eadin'. Ye might find some folk there willin' to tell ye for a price, but mine be worth more'n ye look like ye can afford. The merchants in Mantol-Derith tradin' post 'ave ways to the surface o' course, but I, er, work outside o' those circles, so I cannae tell ye the way. And then the 'neblin know a few, if ye still prefer to try for Bligdenstone. Yer right to stay clear o' them filth drow. Why are ye travelin' with one, or did ye just pick 'im up in the village?

Whatever ye choose, ye cannae travel the lake without a navigator. I take it that's why ye went to that fishfolk village is it? There be another o' their villages on the north shore, if ye want to try there, but it be too close to the drow fer my likin'. O' course I could guide ye to Bligdenstone or Gracklstugh, but not fer naught. I came 'ere to make a sale, but ye see 'ow that turned out, so I'd consider takin' the job if ye have anythin' to offer. Bligdenstone will cost ye more as it be out o' me way. But I if we land far enough south ye'll be safe enough from Menzoberrenzan.

In response to Rhayna's inquiry Hemeth says that he only knows the way to Neverlight Grove from Gracklstugh.

(Just to summarise: The maps that Blurg shared with you are sufficient to find an overland route all around the lake, including to Gracklstugh, Neverlight Grove or Bligdenstone. Travel by water requires a navigator, but now that Shuushar is no longer with you, you can either travel with the duergar or find another)