(almost) Complete Guide to Heroic Opportunities
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A launch-era reference to Heroic Opportunities (HOs), the group combo system where each archetype's abilities advance a shared chain for a bonus effect. It was written in December 2004 and the HO system has changed since, so treat specific combos as historical.
The thread's replies add a few corrections and ask for it to be pinned. The original also offered PDF and Word copies.