While Telos, the Warden would technically be the strongest monster in RuneScape if fought in an encounter of 801% or higher enrage (which would give him a combat level of 10,010), it does not count as his base combat level is 2,000. It should also be noted that if he were to be fought at 4,000% enrage (the highest possible enrage), his combat level would be 42,000.