A small Varus tweak in-line with the ADC changes.

Varus is a pretty balanced ADC, generally speaking. He is neither too weak, nor too strong. He has obvious weaknesses and strengths. But still, with all the ADC changes that have come through and the changes to how his ult works, he could probably use some small tweaks. Nothing too major and that rewards the player for performing well.

My suggested change is thus:

FIRST CAST: Varus channels for up to 4 seconds, increasing Piercing Arrow's range and damage over the next 2 seconds.

Varus can still move while channeling, but cannot use basic attacks or abilities and is slowed by 25% (increased from 20%). At the end of the channel, Piercing Arrow is automatically cancelled, refunding half of its mana cost.

SECOND CAST: Varus fires, dealing physical damage to all enemies in the arrow's path, reduced by 15% per enemy hit down to a minimum of 33% damage. Each enemy hit grants Varus +X bonus movement speed. reduced by X per enemy hit, that decays over .5/.75/1/1.25/1.5 seconds.

A small buff to his Q to allow him to reposition better after he lands a Q, allowing him to keep up with a moving team fight. It can't really be used as an escape, or at least I don't intend it to be used as an escape, as I think that's a weakness that makes sense for him. The intent it to give Varus better options in a team fight with a retreating enemy. The numbers would require tweaking, but I'm thinking smallish numbers like 5 or 10 movement speed for the first hit and then reducing that by 1/2 per enemy hit. If 5 move speed per hit, a 5-man Q nets him a measley 15 movement speed. If by 10 per hit, a 5-man Q nets him a semi-reasonable 30 movement speed.

It wouldn't drastically change Varus, nor make him OP, but it would be a decent QoL change. I think, at least. Someone who is better with numbers could probably go over this and think of better numbers to give him.

The other idea I had is to instead tie the MS buff to the charge of his Q rather than enemies hit. In this way, hitting a fully charge arrow is more rewarding than a 5-man arrow but I was worried that it could be abused, with enough CDR, into letting him escape too easily.