Lately an explorer rediscovered the tunnels, west of the Head altar. What he found led him to death, along with his soul now also wanders the tube. You can speak to him with an amulet of ghostspeak, and he will tell you: When the four of them die. Additionally, he tried to kill everything he found in the tunnels.
You are able to locate the spirits of the family west of the Mind Altar. You aren't going to require a light source, for the caves were light with bleak torches for your Letums to see in. You will walk down a dirt pathway, with two doors to your left and two doors to your right. Viluppo is on the NW, Flech on the NE, Veneno on the SW, and DL on the SE. Each of the family will attack you immediatly because you enter, and you can enter with a team, though you could do a boss solo rather readily.
Viluppo can hit you with an extremely hard melee, which is protected with shield from melee. However, just like K'ril Tsutsaroth, will strike through prayer very hard. However, it strikes slightly less, and slightly more. Viluppo can also summon rats in the wall, which will absorb your magic ability, making you unable to attack Viluppo. The rats have to be murdered with crumble undead.
He is not weak to any particular spell however, as he's wearing bulky melee armor, using a very low magic defense. Flech can hit you using a crossbow that hits faster and more challenging than Karils. It can be 100% protected by keep from range, however, if a bolt will of hit you, it will drain 1 prayer stage in the beginning.
Just to make things all the easier for you, Flech will change her dhide to create her invulnerable into a certain sort of elemental magic (atmosphere, water, ground fire). Flech won't alter dhides till she is attacked once by another kind of element (she will not alter the very first time, but she will not alter if she isn't hit at all). Flech needs to be murdered with an elemental spell.