Kasha

Overview
"Before Falling to the corruption. this forest is home to its Guardian, Kasha. Unattractive as it may be, Kasha abides by the creed of its people and its God, defending against any invaders who dare set their feet on the forest. Kasha attacks every living in the forest, proving itself to be the only hunter in the forest."

- from the in-game Bestiary

Description
These oversized horned felines are the nightmare of many people on foot. They easily outrun sprinting players, turn invisible (Their name is still visible when aimed at) and teleport at short distances (Might have been removed in a recent update) and have a huge aggro range. Most commonly found in the Shard of Faith map's crimsons forests in surprisingly high numbers. Fortunately their health is only mediocre.