Marksman Need meaningful Keystone choices, here's some ideas.
Currently adcs have literally two to three options with some outliers (jhin and MF can take death fire)
We have warlords (sustain/life saver in a pinch) Fervor (straight up damage)
Both of these are severely problematic Because there will never be a meaningful choice. If warlords is strong enough to sustain then lane bullies can't bother with fervor or they will be out sustained out of lane. If fervor is too strong then adcs simply all take it and get extra damage. Unlike other lest ones which indicate a specific play pattern and choice. Adcs will always take whichever is stronger.
Look at thunderlords vs storm raiders (utility vs burst) Thunderlords vs death fire (sustained damage and poke vs burst ) Colossus vs grasp (engage safety and all in vs damage/sustain)
I have some ideas as an ADC main I think would be more meaningful choices and focus more on what an adc wants to do in a particular game or on their style of adc:
KEYSTONE IDEA 1: MOBILITY KEYSTONE
Gain X% move speed after auto attacking an enemy champion. Ramps up with consecutive autos on enemy champions capping at a % of move speed at a certain number of stacks.
Note: think of this like phage or old furor boots but it ramps up with consecutive autos so it's more about moving around in a team fight and can't be used as a free escape and kiting tool if caught out.
KEYSTONE 2: window of increased damage
After auto attacking X amount of times trigger a burst of increased attack speed, attack damage, and critical strike damage (not chance) for X seconds. (Has cool down)
Note: think about this sort of like zekes only not reliant on a binded ally. This would be geared toward those who want to ramp up and all in with this window of strength. Think about champs like Ashe, vayne, Tristana who all want to all in with certain abilities. This would give them something to play around. Numbers would have to adjusted properly as it could be OP, but I think it could work.
KEYSTONE 3: ramping damage on single targets
Each auto attack against the same enemy champion increases damage to that champion by X% up to a cap. Changing targets starts this back at base and has no cool down.
Note: this would be focused on shredding single (most likely Tankier) targets. For those times adcs are forced to stay back and only hit the colossus shield tanks this helps them ramp up their damage significantly over time.
KEYSTONE 4: Burst mitigation
After X auto attacks, become empowered with a spell shield and gain X% lifesteal for X seconds.
Note: so for adcs afraid to get in the fray without blowing up instantly they can sacrifice extra damage or mobility for a chance to survive. The spell shield helps survive burst and the lifesteal helps them live a bit longer afterwards to keep auto attacking a bit longer.
Curious what anyone thinks about these.