Thermonuclear Smoke Devil."Thermy" is a Slayer boss who is an even tougher and bigger version of Smoke Devil that resides among his RS gold smaller siblings in Smoke Devil Dungeon. It can only be attacked during the Smoke Devil task and therefore requires a level of 93 to the Slayer skill. The only monster that gives Smoke Battlestaff which is the most costly of battlestaffs. In addition, it has a slight possibility of leaving Smoke Devil as a pet Smoke Devil.
Another more powerful version of an ordinary monster is The Abyssal Sire which is the boss of Abyssal Demons. For those who have completed the level 85 of the Slayer are able to take on this monster in an Slayer task which is only solo-only. The easiest route to achieve this is through the use the Fairy Ring code D.I.P. Inside Abyssal Nexus there are four rooms where Sire can be defeated, allowing several players to combat this enemy at the same time. The boss is well known for dropping abyssal items including Abyssal Whip and Abyssal Dagger and both of them are available for purchase for a small amounts in Grand Exchange.
Similarly to Dagannoth Kings - Grotesque Guardians are two enemies identified as Dusk and Dawn which count as an individual boss. Those cheap Runescape gold adversaries can be found on top of Slayer Tower in Morytania. To gain access to their rooms, players must purchase an access key before they can enter.