There should be a limitation in the use of rings. If a marriage couple goes together into battle against a huge monster they can easily kill it using just home scrolls and Carmen. This can be easily avoided implementing a time period in which the ring is useless after it has been used, or not allowing Carmen to heal you up if you just used the ring.
Anonymous
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Or, a more general fix, only allowing Carmen to heal you once every 10 minutes say
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This has all been fixed now: Carmen doesn't heal higher level players. Also, in the next release, zones which don't allow teleport also don't allow rings to teleport you in or out.