Description^{?}  

Reduces cooldown for Guthix's Blessing and Rejuvenate by 5% per rank, and total healing by 1% per rank.  
Release date  25 January 2016 (Update) 
Gizmo type  Armour 
Maximum rank  3 
Brief Respite is an Invention perk that reduces the Guthix's Blessing and Rejuvenate abilities' total healing and cooldown. It can be created in armour gizmos.
Brief Respite's value can be judged based on its effective life points healed per minute. The actual effect varies between the two abilities.
Rejuvenate is calculated such that for each time the ability restores life points, the amount restored is $ \frac{40R}{100}\times \frac{1}{16} \times LP $.
Rank  Cooldown  Lifepoints  LP healed  Cooldown (s)  LP/min 

None  0%  0%  40.0%  300  8.0000% 
1  5%  1%  39.6%  285  8.4000% 
2  10%  2%  39.2%  270  8.7111% 
3  15%  3%  38.8%  255  9.1294% 
Guthix's Blessing is at the disadvantage of miscalculated healing, such that each time it restores life points, the amount restored is $ \frac{8  R}{100} \times LP $. Instead of 40% total, Guthix's Blessing heals 35%, 30%, and 25%, depending on rank, with cooldowns equal to that of Rejuvenate. The effective healing is 8% LP/min independently of rank, i.e. making the perk useless in this case.
Calculation
The calculations above for the effective healing $ E $ for rank $ R $ follow the formula:
 $ E = 60 \times \left( \frac{40 \times (1  \frac{R}{100})}{300  15R} \right) $
Sources
Material  Rarity  Perk ranks with X materials  

1  2  3  4  5  
Organic parts  Common  0  0  1  1  1–2  
Refined components  Uncommon  0  1  1–2  1–2  1–2  
Culinary components  Rare  1  1–2  2  2–3  3  
Corporeal components  Rare  0  1  2  2  3  
Ethereal components  Uncommon  0  1  1–2  1–2  1–3 
Abilities  
Damage/Accuracy modifying 

Damage reduction 

Adrenaline 

Prayer 

Additional items 

Experience 

Skilling 

Miscellaneous 
