A Comprehensive Caustic Buff

This is an idea for a comprehensive buff/overhaul of Caustic's kit.

Firstly, his Tactical ability would be the Gas Grenade of his ult, but with the same radius as the trap. Same charges and time to recharge. Difference is, you can throw it the second you switch to it. With that being his new tactical ability, his ult would instead be a gas cloud that comes from Caustic himself. Giving you the ability to chase enemies with gas.

Along with this, his passive would be a limited radius aura (the radius around him of his proposed ult) that would only give the gas immunity to squadmates while keeping the threat vision for him.

On the damage side of things, I think a utility buff instead of a raw damage buff is in order. Make it so that gas-source cloud damage stacks. So that if an enemy is in your tactical cloud radius AND your ult gas radius, they're taking two instances of damage.

I think this would be an interesting mix for Caustic.