504K accounts from Powerbot (powerbot.org) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In approximately September 2014, the RuneScape bot website Powerbot suffered a data breach resulting in the exposure of over half a million unique user records. The data contained email and IP addresses, usernames and salted MD5 hashes of passwords. The site was previously reported as compromised on the Vigilante.pw breached database directory.
Source: Have I Been Pwned (CC BY 4.0)