Telegraph

Telegraph is term used sometimes for attack Indicators shown before attack. In TERA such indicators are shown as red areas in ground before attack.

Also certain special attacks in dungeons, like incoming lightning strike are shown on ground as expanding red circles. Monster attack indicators are only show for in easy mode dungeons.

Monster attack indicators can be turned on or off in game. Option->Game->Game Information->"Display boss monster's attack range" and "Display monster's attack range".