Knowing when a shard is erupting is only half the job — check the live tracker for that. This is about the other half: recognizing the eruption once you're standing in the realm, and surviving the fifteen minutes after it lands if it's a red one. For the full breakdown of what each shard type pays out, see the red shard vs black shard guide.
A shard eruption doesn't land silently. In the minutes before it hits, the sky darkens, lightning intensifies around the mountain the shard is heading for, and the ground shakes — a clear, loud cue that something is about to crack open nearby. This is the tremor window Sky Shard's countdown shows as "LANDS IN": roughly 8 minutes 40 seconds of warning before the shard actually touches down. If you're already in the right area when the shake starts, you have time to get into position — you don't need to be standing on the exact spot the second it lands.
Black (regular) eruptions have no hazard at all. There's nothing chasing you and nothing that can knock you off the shard — it's entirely safe to collect solo, which is why most players treat it as a casual pickup on the way to something else rather than something to plan around.
Red (strong) eruptions spawn a hostile guardian on the shard piece — a Dark Crab. Getting close to a Dark Crab drains your cape energy just from proximity, not only on direct contact, and it will actively knock you off the shard if it catches you mid-collect. That's why red shards are usually a group activity rather than a solo run: more players means more chances someone gets a piece out even if others get bumped off.
The Dark Crab telegraphs its attack — it shifts into an aggressive stance and turns toward you before it actually lunges, so watching its posture instead of panicking and running blind gives you a beat to sidestep out of the way. One tip worth being skeptical of: some players claim repeatedly using the Deep Call gesture will "flip" a Dark Crab onto its back. That's not consistent with how the mechanic is documented — Deep Call is more likely to draw every nearby crab's attention onto you than to neutralize one, so don't rely on it as a defensive tool.
Two mix-ups come up often. First, some new players avoid shard eruptions entirely out of caution, not realizing only red shards carry any risk — black shards are completely safe, so there's no reason to skip them. Second, players sometimes assume Ascended Candles only come from the weekly Eye of Eden run; red shard eruptions are a second, independent source of Ascended Candles, so a bad Eye of Eden week isn't your only shot at the currency that cycle.
Each scheduled day has three eruptions — 8 hours apart for black shards, 6 hours apart for red shards — and each stays open for roughly 3 hours 51 minutes before closing. If you miss one window, you're not locked out for the whole day; check today's remaining eruption times and catch the next one instead.