Mentality

Mentality is a mechanic that may cause visual effect once low. This can cause distractions for the player. Normally, it is at 300. However, it can be increased or decreased by specific standards.

Increasing Mentality
Increasing mentality will occur many different ways. This includes being indoors, daytime, Happy!, defeating bosses, and defeating monsters. This is the chart in mentality increased:

Defeating a hardmode boss: 75+

Defeating a prehardmode boss: 50+

Happy buff: 35+ per min

The Hallow: 30+ per min

Being indoors: 25+ per min

Daytime while outside: 10+ per min

Defeating a nonboss enemy: 2+

Decreasing Mentality
Just like you can increase mentality, it can also be decreased. This includes certain biomes, nighttime, and rain. This is the chart:

Rain outdoors: -3 per min

Nighttime outdoors: -5 per min

Corruption/Crimson: -10 per min

Blood Moon/Solar Eclipse outdoors: -20 per min

Being in the Lava Grounds (found under caves): -50 per min

The Negatives
There are negative effects to losing mentality. The chart below shows:

Less than 89%: Double vision sporadically appears and becomes more frequent as mentality is lost

Less than 80%: The lighting becomes slightly dimmer and becomes more dimmer as mentality is lost

Less than 70%: White spots with pupils, often in pairs, appear in darkness, including night, being small and friendly, sometimes willing to help and interact. You can trade with these and even gather them as pets. However, as mentality is lost, they become larger and lose their black marks under them signalling happiness and become angrier and larger. This exception is to your pet. They disappear after a few minutes, unless you have traded with them.

Less than 60%: A light red tint will sporadically appear around the screen and fade, become more frequent and bold as mentality is lost

Less than 52%: White spots become untradeable

Less than 46%: A whirring ambience can be heard quietly in the background, gets louder as mentality is lost

Less than 36%: White spots will appear angriest here, never become more angry, but are passive and never attack

Less than 18%: NPCs are uninteractable

Less than 11%: Transparent NPCs fly across the screen to attack the player