The Sage is one of the NPCS in the Thieving skill.

This page is up to date (v1.2.2).
Sage
Sage
Area: Mushroom Forest
Requirements: Thieving Level 110
Perception: 1,095
Max Hit: 410
Experience: 282 XP

Loot

Successfully pickpocketing the Sage will always give 1 - 1,300 

Possible Common Drops:

Up to one of these will be received on a successful pickpocket:

Item Qty Price Chance
  Mushrooms 1 - 3 75 - 225  33/188 17.55%
  Pumpkin Seeds 1 - 2 100 - 200  33/188 17.55%
  Chilli Seeds 1 - 2 130 - 260  6/47 12.77%
  Mushroom Spores 1 - 2 230 - 460  15/188 7.98%
  Starfruit Seeds 1 - 2 300 - 600  3/47 6.38%
  Snowcress Herb 1 425  3/47 6.38%
  Bitterlyme Herb 1 580  9/188 4.79%
  Wurmtayle Herb 1 - 2 925 - 1,850  3/188 1.60%
Total: 3/4 75.00%

The loot obtained from the average successful pickpocket is worth 210.84  if sold.

Including GP, the average successful pickpocket is worth 861.34 .

Possible Rare Drops:

Any of these can be received after a successful pickpocket:

Item Qty Price Chance
  Bobby's Pocket 1 4,000  1/120 0.8333%
  Chapeau Noir 1 32,000  1/20,000 0.0050%
  Sneak-Ers 1 15,000  1/15,000 0.0067%
    Thieving Shorts 1 15,000  1/15,000 0.0067%

Possible Area Unique Drops

Any Area Unique Drop is equally likely to be obtained after a successful pickpocket. Each Area Unique Drop is rolled for separately, so it is possible to receive multiple Area Unique Drops from a single action. The chance of receiving an Area Unique drop is tripled if the 95% Thieving Mastery Pool checkpoint is active.

Item Qty Price Chance
  Exotic Herb Sack 1 20  1/500 0.20%
  Mushrooms 10 75  1/500 0.20%
  Mortar and Pestle 1 1,200  1/500 0.20%

Possible NPC Unique Drop

The chance of receiving the unique drop for an NPC is based on a combination of several factors. The unique drop chance for an NPC is included in the tooltip for your Stealth against that NPC. The unique drop for the Sage is   Potion Stirrer.