ok to get here.. use maelle in ST, and transport to Kaineus town (Ktown).. once in ktown, open your mini map again, look for the exit top way up at the top. that is the entrance to Lavastone.

and the strategy for this boss is the same.. kill the spawn to make the counter go down.. once counter is down defeat the boss and all his minions..

Boss name: Slade
Level Limit: Above lvl 50
Time limit: 10 minutes
Boss location: Kaineus town
and boss #4

to get here, you need to be at LEAST 57+.. i say this because this boss room is located on a 57+map; unos, mier island, malus ora. so go to ST, and talk to bianca to take the boat to mier island.. once in mier island(aka unos), open your map again and go to the exit dot at the top left corner of the lap. that is the entrance to malus ora.. once inside malus ora you are looking for Evil Carnuba, it is located in the bottom portion of the map.. and that maps easy, theres only 2 exits, the one you came in through and the one on the bottom...

once inside, it it the same procedure.. kill the mobs, boss spawns.. kill minions and boss, get your rewards...

Boss name: Matariel
Level limit: above lvl 70
Time limit: 10 minutes
Boss locations: unos/malus ora
hope these help, do you want to buy cronous cro for your character, if you need to buy these goods.