Con Ammo Nanite Swarm

On-hit: Basic attacks infect enemies with Nanite Infestation for 10 seconds, stacking up to 8 times. Each stack of Nanite Infestation deals 0.4% = [(0.3%) + (0.1%) targets maximum HPMax] physical damage. Nanites reduce the target’s healing done and healing received by 5% (up to 40%).

When a target with 5 or more stacks of Nanite Infestation receives or grants healing, it triggers Zero Protocol:
The triggering healing is converted into physical damage instead, equal to the amount that would have been healed. All nanites leave the body, spreading in a 5-metre area applying half of the Nanite Infestation to all enemies in the zone.