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Obiiru (オビール) is a snake enemy from Mega Man X4 that usually appears in groups. Their debut and only appearance is in Web Spider's stage. Obiirus attack by roaming into the player, chasing him down by slowly crawling on the ground. Shooting them with the X-Buster or slashing with the Z-Saber is the easiest way to get rid of them. It is important to note that they are able to fall vertically from a higher platform, and sometimes lurk in the leaves to drop and surprise the player.