Could these event by any chance be triggered by certain conditions? For example;
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Last raid was X amount of days ago (I’d say once per week to avoid the novelty wearing off. The music in Boundless is superb, but you made a wise choice to have it play after long intervals; it makes the moment seem that bit more special - I feel these events should be treated similarly)
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X amount of players within a certain proximity of one another. It would be a shame to have the weekly raid happen when there’s nobody around.
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Settlement Prestige rating (or classification) is above X. The scale of the raid could depend on the size of the settlement. I can see it now - Great Cities having shelters, keeps, towers and walls in place in preparation for such events!
These mob swarms were so much fun. Even though they were technically an exploit, I believe most of us weren’t there for the experience or loot (although nice), we were there for the action and comradery.
One more suggestion;
- Bosses - have the raid culminate in a battle against a tough opponent. Perhaps even have themed waves followed by a named opponent, for example; a thousand Spitter’s follow by their fierce and terrifying leader ‘Pseudo’s Bane’!
Edit; another suggestion;
- Changes in weather and music. @Scratchnwiff made a comment about Helms Deep in his video which got me thinking; wouldn’t it be ominous if the music took a sudden turn and atmosphere began to change?
I don’t know if you’ve played Kingdom, but during certain nights the sky goes blood red, and eerie music begins to play before the onslaught. I think that game captured the dread of swarming raids perfectly.