Bane ammunition
Info
Bane ammunition is an untradeable form of ranged ammunition that can be created after Ritual of the Mahjarrat. It requires level 60 Ranged and has level 60 damage, but has an increased effectiveness of +40% auto-attack damage, 25% ability damage, and 30% hit chance boost against the correct monster (see the table below).
Chargebows used to disallow the use of bane ammunition, making them not as effective against the monsters that can be affected by them, and useless against rune dragons, until an update changed that, and now they take on the effects of using bane ammunition, as long as you have those equipped.
https://runescape.wiki/w/Bane_ammunition
Tune Banite Ore
Tune Banite Ore is a Lunar spell which requires 87 Magic (can be boosted) and partial completion of the Ritual of the Mahjarrat quest. Players learn the spell in Kethsi where they find and read the tune banite ore scroll. It requires 2 astral runes, 4 earth runes, 1 banite orein your inventory and an item related to the monster that the banite ore is to be tuned to. The item will not be consumed.
After that it can be smelted into bane bar corresponding to its attunement, using any furnace (which requires 80 Smithing), then smithed on the anvils on Kethsi (80 Smithing for arrowheads and bolts), and then finally fletched into arrows (76 Fletching required) or bolts(80 Fletching and 82 Smithing required). Bolts made from bane ore are made 50 at a time, rather than the usual 10.
The projectiles also require high level equipment to fire from. Arrows can be fired from Magic bows and up and bolts from Rune crossbows and up.
https://runescape.wiki/w/Tune_Banite_Ore