Total cost decreased.
Seeker's Armguard is a reactive purchase for mages who need extra armor in rough matchups. With the cost of Lost Chapter going up, we don't want Seeker's Armguard to take that much longer to purchase in those rough matchups.
TOTAL COST :  ⇒ 1100
UPGRADED : Zhonya's Hourglass' total gold cost is unchanged.
Armor up. Build path includes an extra Cloth Armor.
For those looking for buffs to Zhonya's Hourglass, it should be clear we're not doing that. Given how game-warping Zhonya's active can be - and how powerful a deterrent it is against dudes who want to blow you up - we're pretty firm on gating this active with a fair combine cost.
That said, Seeker's. Even when it's the right situation to buy Seeker's, it feels wrong, so that's where we're making changes. Mixing in an extra armor item makes it more effective when you're looking to counter physical damage (read: Zed) in lane.
BUILD PATH : [Cloth Armor + Amplifying Tome + 465 gold] ⇒ Cloth Armor + Cloth Armor + Amplifying Tome + 165 gold
ARMOR :  ⇒ 30
ABILITY power :  ⇒ 20
armor :  ⇒ 25
- Ability Power reduced to 20 from 25