TokTz-Ket-Dill

Talk to TzHaar-Ket-Grol south-west, at the crack in the wall (with at least one empty inventory slot).

Enter the tunnel to the library north-west of the Main Plaza.

Speak to TzHaar-Mej-Lor.

Talk to Reldo in the Varrock library about TzHaar language.

Along the west wall, in the cluster of 3 bookcases, search the middle one for the TzHaar Tourist Guide.

Read the TzHaar Tourist Guide along with the note inside.

Return to TzHaar-Ket-Grol.

Go east and pass the cave entrance.

Enter the mine directly east and speak with TzHaar-Hur-Brekt on the east side, then talk again.

Speak to TzHaar-Hur-Klag on the west wall.

Speak to TzHaar-Mej-Kol, just north.

Speak to TzHaar-Xil-Mor, south-east in the mine.

Speak to TzHaar-Hur-Brekt.

Speak to TzHaar-Xil-Mor.

Speak to TzHaar-Hur-Brekt.

Speak with TzHaar-Ket-Jok, south-west in the mine.

Speak with TzHaar-Xil-Mor.

Speak with TzHaar-Hur-Klag.

Speak with TzHaar-Mej-Kol.

Finally speak to TzHaar-Hur-Brekt.

You will need to make 17 stone pillars in total, but not all at once (there isn't enough space for 17 pillars and 14 planks.)

Mine the Stone slab vein and craft 4 pillars for the first cave section (you can easily return for more).

Go to the quest start location and have your planks treated by the small TzHaar-Hur-Frok.

Enter the crack in the south wall by TzHaar-Ket-Grol.

Some sections of the walls have caved-in (shown as red corridor sections on the minimap) and some sections of the ceiling have caved-in (shown as piles of rubble, as well as pale brown shapes on the minimap).

If the examine info for a cave-in says "The damage in this location is bad / isn't too badly damaged", use a plank on it.

If the examine info for a cave-in says "The damage in this location is very bad/badly damaged/very badly damaged", use a pillar on it. You cannot walk through these, and must place them from 1 tile away. Don't accidentally block yourself off with them, or you will need to push them over and get more pillars. If you run out of pillars, you can simply lobby and you'll end up outside of the cave, near the mine. You can then return to where you left off.

Using the wrong item on a cave-in can cause a few hundred damage.

The first cave requires 6 treated planks and 4 pillars. After fixing the cave-ins, mine the blocked tunnel and proceed to the next checkpoint.

The second cave requires 6 treated planks and 6 pillars. The fire monster can only be harmed by magic with water spells or necromancy.

The third cave requires 2 treated planks and 7 pillars. The first two lava monsters can only be harmed by ranged weapons with an attack range of 5 spaces or higher or by using necromancy. You will need to use magic with water spells or necromancy on the final fire monster. You cannot cross the stones before killing all three lava monsters.

Once you've cleared the southern entrance in the chamber with the trapped TzHaar-Hurs, you will no longer be able to use the crack in the wall to access the tunnel. You must use the entrance north of the three NPC's where you started the quest.

Once you are ready to fight the TokTz-Ket-Dill, enter the tunnel to the north.

If you die, your gravestone will appear in the chamber with the trapped TzHaar-Hurs, outside the tunnel to the TokTz-Ket-Dill.

Kill the TokTz-Ket-Dill by breaking its armour with a pickaxe equipped, then using only melee attack. Do not use prayers until the shell is broken.

After killing the TokTz-Ket-Dill, exit to the north, head south out of the caves, and then talk to any of the three starting TzHaar to finish the quest.