The gate can be locked and once you defeat the Minotaur, you can loot the chest in game

At this level (level 4 on normal), the most useful crowd control to use rs2 gold is Web, Glitter-dust and Hypnotism (or Hypnotic Pattern. Glitter-dust works perfectly against the Trogs who stay invisible until ready to attack. As for resists, acid and fire will come in handy.

Once they are all defeated, you can loot the chest in the room. Go back to shrine if you need to before advancing to the Depths of Darkness entrance just to further south of Sslysk's room.

Now that's the easy route. The tougher one is to take the west route upon entering the tunnel. If you are after Conquest and optional, or you just really want to meet all the creatures inside the tunnel, then this route is for you. Early on, you will encounter spiders and slimes.

The gate can be locked and once you defeat the Minotaur, you can loot the chest. As you go further, you will encounter the named Boss the Eater and there will be a Troglodyte Shaman and a couple of Hell Hounds on one side and a Medium Earth Elemental on the other side.

If you really wish to explore the area, turn right from direction of The Eater to encounter more Oozes and undead consisting of Zombies, Weights and Ghouls. Continue to move to areas that are not yet marked in the map before you proceed down south to where Sslysk is.