Liandry's Torment Change-up?
Not considering Haunting Guise (which would need a rework probably), I thought a dedicated poke item with some CDR would be nice to have. Xerath, Ziggs, and other artillery mages seem to be lacking something that isn't a defensive item to give them CDR besides Mordellonomicon.
This is a rough idea aimed at rewarding champions for consistently poking enemy champions or sticking to them for a long duration. Tweaks definitely needed.
Liandry's Torment 
Cost: 3000
[EXAMPLE] Builds from: Fiendish Codex 
+ Blasting Wand 
+ Aether Wisp 
+ 400g
+100 ability power +6% movement speed UNIQUE: +10% cooldown reduction UNIQUE - AGONY: Dealing spell damage applies a damage-over-time effect that deals bonus magic damage equal to 1% of the target's current health per second for 4 seconds. Enemies take 1% more magic damage from all sources for every second that they are afflicted with AGONY, stacking up to 15 times and lasting for 1.5 seconds after the last tick of AGONY has completed. Upon reaching 15 stacks, enemies are dealt 10% of their maximum health as magic damage over 3 seconds.
