Gloam Sickness

Description
Gloam sickness is a mysterious disease of magical origin that gradually reduces the sufferer's will to live, causing them to eventually turn into a Hollow Man. The disease first causes a general malaise, followed by disorientation, then the sufferer enters a languid stupor. If help cannot be administered by this point, (un)death awaits. The disease can be easily cured at any stage but the last simply by removing the sufferer from the stupefying light of the Gloaming Wood.

Progression
Every 1d4+2 days, those exploring the wood have the chance to advance another stage in the disease by performing a CON saving throw, succeeding on a 15 DC. At every stage, the DC goes up by 2 every time you succeed. This DC is reset to the base value when you advance to the next stage.

Wearing SPEX reduces the DC by 3.

Drinking Phraxleaf tea reduces the DC by 2 as long as you have consumed a cup every day since your last check.

Stage 1
You have disadvantage on death saving throws.

Stage 2
During this stage, you will lose 5 points of maximum health for every failure.

Stage 3
When you reach 0 hitpoints, you die and become a Hollow Man, doomed to wander the Gloaming Wood until withering away.