Nature staff

The Nature staff is a magic weapon released with the Dungeoneering skill, on 12 April 2010. It costs 12,500 Dungeoneering tokens. Players can store up to 1000 nature runes in it, and remove them at any time. When wielded, there is a 1/10 chance that a nature rune is not spent when casting a spell that requires such runes. An Attack level of 40 and a Magic level of 53 is required to wield the staff.

When the staff's effect activates, the message reads: 'Your staff magically pays for the cost of the nature rune.' This message is blocked by the game spam filter.

Assuming fire runes will stay at 0gp, the nature staff is worth using for High Alchemy when nature runes are over 0gp. With superheat, the nature staff is worth using when nature runes are over 0gp.

If you have nature runes in your inventory, as well as in the equipped staff, you will use up the ones in the staff first.

Cost Analysis
The following is a comparison of the cost per cast of spells using nature runes while using an elemental staff as opposed to using a Nature staff. The cost per cast when using the Nature staff is approximate and assumes that exactly 1 out of 10 nature runes are saved.

While it would appear that using the Nature staff for High Level Alchemy would be profitable, using the nature staff and foregoing free fire runes results in a difference of.

Trivia

 * The Nature Staff used to cost 60,000 Dungeoneering Tokens before the 21 April 2010 update.