Sun Exposure

 is a debuff inflicted during Daytime when the player is exposed to direct sunlight for too long. It has no icon, but is indicated by a ray of sunlight and a gradual brightening of the screen and finally the player going up in flames when damage starts to be taken.

Effects

 * Exposure level ticks up while in sunlight and ticks down while shaded (does not reset immediately in shade) at the same rate
 * Causes rapid damage over time once the maximum exposure level is reached and will cause death within seconds

Countermeasures
can be built early on to produce a small circle of shade within a base by burning Bones.

Areas fully enclosed by Stone Walls and Flooring will create a room and automatically be covered with a roof.

Sun Resistance
The Sun Resistance rating increases the amount of time that can be spent in sunlight before damage is dealt.

Exposure time
The base exposure time before a player starts burning is 5 seconds.

The exposure time is increased by 1.5x the amount of Sun Resistance (in percent). The exact multiplier currently applied can be viewed by hovering over Sun Resistance in the resistances section of the Character menu.

Exposure damage
After a player starts burning from being exposed to sunlight for too long, they will start to take exposure damage.

The amount of damage a player takes is 20% of maximum health per second. That means it will always take 5 seconds (at full health) or less to die from exposure damage. The only way to avoid exposure damage is to avoid burning all together, which can only be delayed by increasing Sun Resistance.

Increasing Sun Resistance
There are a number of easy ways to increase Sun Resistance: Applying all of the above basic bonuses, a fixed total of 75 Sun Resistance can be obtained.
 * gives +10 resistance
 * Cloaks all give +15 resistance
 * gives +25 resistance
 * gives +25 resistance
 * gives +25 resistance
 * gives +25 resistance
 * gives +25 resistance

If the player or the players clan is in possesion of the Soul Shard of Solarus the Immaculate and obtaining it's Buff, which gives 50 more resistance for a total of 125 Sun Resistance.

Consuming Creature Blood with at least 30% quality increases above values by another 10% to 25% at 60% quality blood and by consuming blood with 100% quality it will boost that effect by further 30% (effectively another 7.5% on top), for a total of plus 32.5% to over-all Sun Resistance.

Comparison with Creature Blood effects
{| class="mw-collapsible mw-collapsed fandom-table" ! colspan="7" |

10% effect (minimum)
! rowspan="3" |Description ! colspan="3" |Base values ! colspan="3" |Effect applied ! rowspan="2" |Value ! colspan="2" | Exposure time increase in ! rowspan="2" |Value ! colspan="2" |Exposure time increase in !~ % !seconds !~ % !seconds
 * Signet only
 * 10
 * 15%
 * 0.75s
 * 11
 * 17%
 * 0.85s
 * Cloak only
 * 15
 * 23%
 * 1.15s
 * 16.5
 * 25%
 * 1.25s
 * Cloak + Signet
 * rowspan="3" |25
 * rowspan="3" |38%
 * rowspan="3" |1.9s
 * rowspan="3" |27.5
 * rowspan="3" |41%
 * rowspan="3" |2.05s
 * Buff (Brew) only
 * Bear form only
 * Signet + Buff
 * rowspan="2" |35
 * rowspan="2" |52%
 * rowspan="2" |2.6s
 * rowspan="2" |38.5
 * rowspan="2" |58%
 * rowspan="2" |2.9s
 * Signet + Bear
 * Cloak + Buff
 * rowspan="2" |40
 * rowspan="2" |60%
 * rowspan="2" |3s
 * rowspan="2" |44
 * rowspan="2" |66%
 * rowspan="2" |3.3s
 * Cloak + Bear
 * Soul Shard only
 * rowspan="4" |50
 * rowspan="4" |75%
 * rowspan="4" |3.75s
 * rowspan="4" |55
 * rowspan="4" |83%
 * rowspan="4" |4.15s
 * Buff + Bear
 * Signet + Cloak + Buff
 * Signet + Cloak + Buff + Bear
 * Basic bonuses - without signet
 * 65
 * 98%
 * 4.9s
 * 71.5
 * 107%
 * 5.35s
 * Basic bonuses - with signet
 * 75
 * 113%
 * 5.65s
 * 82.5
 * 124%
 * 6.2s
 * Soul Shard - without Signet
 * 115
 * 173%
 * 8.65s
 * 126.5
 * 190%
 * 9.5s
 * Soul Shard - with Signet
 * 125
 * 188%
 * 9.4s
 * 137.5
 * 206%
 * 10.3s
 * }
 * Soul Shard - without Signet
 * 115
 * 173%
 * 8.65s
 * 126.5
 * 190%
 * 9.5s
 * Soul Shard - with Signet
 * 125
 * 188%
 * 9.4s
 * 137.5
 * 206%
 * 10.3s
 * }
 * 10.3s
 * }

{| class="mw-collapsible mw-collapsed fandom-table" ! colspan="7" |

25% effect (full)
! rowspan="3" |Description ! colspan="3" |Base values ! colspan="3" |Effect applied ! rowspan="2" |Value ! colspan="2" |Exposure time increase in ! rowspan="2" |Value ! colspan="2" |Exposure time increase in !~ % !seconds !~ % !seconds
 * Signet only
 * 10
 * 15%
 * 0.75s
 * 12.5
 * 19%
 * 0.95s
 * Cloak only
 * 15
 * 23%
 * 1.15s
 * 18.75
 * 28%
 * 1.4s
 * Cloak + Signet
 * rowspan="3" |25
 * rowspan="3" |38%
 * rowspan="3" |1.9s
 * rowspan="3" |31.25
 * rowspan="3" |47%
 * rowspan="3" |2.35s
 * Buff (Brew) only
 * Bear form only
 * Signet + Buff
 * rowspan="2" |35
 * rowspan="2" |52%
 * rowspan="2" |2.6s
 * rowspan="2" |43.75
 * rowspan="2" |66%
 * rowspan="2" |3.3s
 * Signet + Bear
 * Cloak + Buff
 * rowspan="2" |40
 * rowspan="2" |60%
 * rowspan="2" |3s
 * rowspan="2" |50
 * rowspan="2" |75%
 * rowspan="2" |3.75s
 * Cloak + Bear
 * Soul Shard only
 * rowspan="4" |50
 * rowspan="4" |75%
 * rowspan="4" |3.75s
 * rowspan="4" |62.5
 * rowspan="4" |94%
 * rowspan="4" |4.7s
 * Buff + Bear
 * Signet + Cloak + Buff
 * Signet + Cloak + Buff + Bear
 * Basic bonuses - without signet
 * 65
 * 98%
 * 4.9s
 * 81.25
 * 122%
 * 6.1s
 * Basic bonuses - with signet
 * 75
 * 113%
 * 5.65s
 * 93.75
 * 141%
 * 7.05s
 * Soul Shard - without Signet
 * 115
 * 173%
 * 8.65s
 * 143.75
 * 216%
 * 10.8s
 * Soul Shard - with Signet
 * 125
 * 188%
 * 9.4s
 * 156.25
 * 234%
 * 11.7s
 * }
 * Soul Shard - without Signet
 * 115
 * 173%
 * 8.65s
 * 143.75
 * 216%
 * 10.8s
 * Soul Shard - with Signet
 * 125
 * 188%
 * 9.4s
 * 156.25
 * 234%
 * 11.7s
 * }
 * 11.7s
 * }

{| class="mw-collapsible mw-collapsed fandom-table" ! colspan="7" |

32.5% effect (boost)
! rowspan="3" |Description ! colspan="3" |Base values ! colspan="3" |Effect applied ! rowspan="2" |Value ! colspan="2" |Exposure time increase in ! rowspan="2" |Value ! colspan="2" |Exposure time increase in !~ % !seconds !~ % ! seconds
 * Signet only
 * 10
 * 15%
 * 0.75s
 * 13.25
 * 20%
 * 1s
 * Cloak only
 * 15
 * 23%
 * 1.15s
 * 19.875
 * 30%
 * 1.5s
 * Cloak + Signet
 * rowspan="3" |25
 * rowspan="3" |38%
 * rowspan="3" |1.9s
 * rowspan="3" |33.125
 * rowspan="3" |50%
 * rowspan="3" |2.5s
 * Buff (Brew) only
 * Bear form only
 * Signet + Buff
 * rowspan="2" |35
 * rowspan="2" |52%
 * rowspan="2" |2.6s
 * rowspan="2" |46.375
 * rowspan="2" |70%
 * rowspan="2" |3.5s
 * Signet + Bear
 * Cloak + Buff
 * rowspan="2" |40
 * rowspan="2" |60%
 * rowspan="2" |3s
 * rowspan="2" |53
 * rowspan="2" |80%
 * rowspan="2" |4s
 * Cloak + Bear
 * Soul Shard only
 * rowspan="4" |50
 * rowspan="4" |75%
 * rowspan="4" |3.75s
 * rowspan="4" |66.25
 * rowspan="4" |99%
 * rowspan="4" |4.95s
 * Buff + Bear
 * Signet + Cloak + Buff
 * Signet + Cloak + Buff + Bear
 * Basic bonuses - without signet
 * 65
 * 98%
 * 4.9s
 * 86.125
 * 129%
 * 6.45s
 * Basic bonuses - with signet
 * 75
 * 113%
 * 5.65s
 * 99.375
 * 149%
 * 7.45s
 * Soul Shard - without Signet
 * 115
 * 173%
 * 8.65s
 * 152.375
 * 229%
 * 11.45s
 * Soul Shard - with Signet
 * 125
 * 188%
 * 9.4s
 * 165.625
 * 248%
 * 12.4s
 * }
 * Soul Shard - without Signet
 * 115
 * 173%
 * 8.65s
 * 152.375
 * 229%
 * 11.45s
 * Soul Shard - with Signet
 * 125
 * 188%
 * 9.4s
 * 165.625
 * 248%
 * 12.4s
 * }
 * 12.4s
 * }

Trivia
Sunlight shining through (open) windows in a castle does not harm the player. Sunlight coming through open gates however does.

The maximum value of Sun Resistance that can be obtained is ~166 (165.625) which equals to 248% increase in exposure time before taking damage.