So yeah he's got some changes on the PBE. Wanted to start a civil discussion about him as I do play him quite a bit lately.
Here's the Riot response from Scruffy.
Sylas Mechanics Changes
We have some Sylas work coming to PBE for patch 10.1. The core goal here is to shift his mechanics in a way that open up some weaknesses for him in very high level play while making him a viable champ for the majority of players (it’s a buff overall). We’re combining a set of strategies that we think will lead to this outcome:
Less lane control, but significantly stronger late - having a safe, strong lane leads to being a strong option in all possible matchups. To counterbalance we’re buffing his late game across multiple axes (damage, tankiness, cooldowns)
Mid viability over jungle - Juggling multiple roles lead to an additional strength as a flex pick. We think we can get him to a healthier spot for mid lane if we don’t allow him to be a strong flex pick in jungle
Remove tools - E shield. Having a tool for every situation is something that can lead to this problem so we are going to remove the shield on E and give back the power in other places on the kit.
Lowering skill floor on passive and W - We want to soften a few of the optimizations that many players are struggling to access without pulling out the decisions and skills of experienced players entirely.
Here is his current PBE numbers via Surrender at 20
Base HP lowered from 585 to 525
HP Per Level increased from 95 to 115
Base Armor lowered from 32 to 27
Armor Per Level increased from 3 to 4
MR lowered from 39 to 32
MR per level increased from 1.25 to 1.75
Petricite Burst (Passive)
Max charges increased from 2 to 3
AOE range lowered from 400 to 300
Chain Lash (Q)
base damage changed from [45/70/95/120/145 (+60% AP)] to [60/70/80/90/100 (+40%AP)]
secondary damage changed from 45/70/95/120/145 to 40/85/130/175/220
Slow changed from 15/20/25/30/35% to 25% at all ranks
Slow duration lowered from 2s to 1.5s
Cooldown increased from 9/8/7/6/5 to 10/9/8/7/6
Cooldown changed from 14/13.5/13/12.5/12 to 14/12.5/11/9.5/8
Mana increased from 45/45/50/55/60 to80/90/100/110/120
Damage increased from [65/100/135/170/205 (+65% AP)] to [65/115/165/215/265 (+85% AP)]
[Removed] Damage amp when enemy below 40% health
Base healing changed from [70/90/110/130/150 (+50% AP)] to [30/60/90/120/150 (+60% AP)]
Healing amp at >40% health lowered from 75% to 50%
[meaning max heal is double base healing]
[Changed] heal always goes off, no longer need to hit a champion to heal
Abscond / Abduct (E)
Cooldown changed from 14 at all ranks to 14/13/12/11/10
[Removed] no longer grants a shield
Damage increased from [70/85/100/115/130 (+20% AP)] to [80/130/180/230/280 (+100% AP)]
So yeah these are the changes and Riot's context for them?