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Low-power and Lossy Networks (LLNs) comprise nodes characterised by constrained computational power, memory, and energy resources. The LLN nodes empower ubiquitous connections amongst numerous devices (e.g. temperature, humidity, and turbidity sensors, together with motors, valves and other actuators) to sense, control and store properties of their environments. They are often deployed in hostile, unattended, and unfavourable conditions. Securing them often becomes very challenging. The extent of interconnected LLN devices poses a series of routing threats (e.g. wormhole, grayhole, DIO suppression, and increase rank attacks). Consequently, an efficient and effective intrusion detection system (IDS) is of utmost importance in identifying anomalous activities in the IPv6 over Low-powered Wireless Personal Area Networks (6LoWPAN). This article proposes a robust Adversarial Reinforcement …