Mind essling

Mind esslings are a type of Essling found on all floors of the Runespan. They can be siphoned for mind runes, requiring one rune essence and giving one mind rune and 10 Runecrafting experience for a successful siphon; an unsuccessful siphon will give no runes, consume no essence, and give 0-2 experience. They require level 1 Runecrafting to siphon.You can absorb 5 mind runes before the Essling dies, leaving 50 rune essence. However, if the player stopped siphoning before the Essling was drained, they will not receive any essence. They respawn every 5 seconds.

Chipping
Mind esslings can also be "chipped" for rune essence. By using 10 Air runes on the Essling, you will receive 10-20 rune essence. However, the same Essling cannot be chipped twice in a row; you can't chip the same creature until you have chipped three other Runespan creatures of any type.

Lower level
Mind esslings can be found on platforms 8, 17, 24, 17, 30, 32, 36, 46, 47, 50, and 51 of the lower floor.

Middle level
Mind esslings can be found on platforms 1, 2, 3, 5, 21, and 23 of the middle floor.

Upper level
Mind esslings can be found on platforms 7, 8, 11, and 19 of the upper floor.

Trivia

 * Essling is a portmanteau of essence and "ling" meaning either child of, or smaller creature.
 * Mind Esslings have the mind rune symbol on the top of their heads.