Ink Saver (Sub)
From Inkipedia, the Splatoon wiki
The Ink Saver (Sub) ability decreases ink usage of your sub weapon up to 75% of its normal usage. The sub weapon's revised ink usage is indicated by the red arrow icon on your Character's Ink Tank. This allows you to deploy sub weapons like Splat Bombs and Burst Bombs, with greater frequency.
In-Depth Ability
Use
Gear
Ink Saver (Sub) is the main ability of: