SHIPWRECK CLASS: ROGUE WAVE Risk Assessment Score 3: Usually nonaggressive, but fairly easy to agitate. May pose a threat due to hazardous conditions in proximity. Avoidance strongly recommended.
Resembling a huge ray, rogue waves are one of the more mysterious and unpredictable species of disaster ghost. They are rarely observed despite their considerable size, as they spend the vast majority of their time floating peacefully at a moderate depth and take little interest in passing ships or any other human presence. However, they are known to turn aggressive without warning, causing rough seas by lashing their long tails and rearing their massive bodies out of the water to come crashing down on small vessels. There is little indication of what provokes this behavior, though some speculate that attacks are more frequent on days with clear weather. It is recommended that all vessels stay up to date with the latest radar technology in order to reliably detect and avoid these not-so-gentle giants. (description edited and expanded by @medikalemergency )