How Does Insight Affect Beasthood?

Gaining insight will reduce beasthood, while losing insight will increase it again. Gaining insight has known to drive some "mad" yet the knowledge they gain is considered a blessing, thus making you more susceptible to frenzy.

What is Insight good for bloodborne?

Just like Blood Echoes in Bloodborne, Insight is used to purchase certain items from vendors in the game. But the amount of Insight you have on you will also alter the game's difficulty. Enemies will use more abilities in their attacks and sometimes, new "things" will appear.

Does Insight make bloodborne more difficult?

Insight is also something that can be used to purchase rare items from Insight Bath Messengers. Higher Insight levels will increase the difficulty of the game because enemies will gain new and more powerful attacks.