What do you build against percent health true damage?
I'm playing against a Vayne as a tank, and I'm baffled on what to build. I tried a frozen heart, a Sterak's Gage, but nothing works. Pls send help ;-;
I'm playing against a Vayne as a tank, and I'm baffled on what to build. I tried a frozen heart, a Sterak's Gage, but nothing works. Pls send help ;-;
Since % health true damage truly has no counter, the only thing i can think of are sheilds.
Build damage. The best defense is a good offense!
Trying to tank the damage usually won't help very much. A straight build won't help you, though frozen heart and sterak's gage are good defensive items against vayne. You need to focus on your tactics and coordinate with your team to catch the vayne out of position. If you're laning against them with a tank, it'll be easier if you call your jungler over early and try to get kills to deprive the vayne of farm (she is a hypercarry, she'll get really strong late game).
Playing a champ that has a gap closer and/or possibly a stun/slow will help a lot. But the point is to shut the vayne down before she can do tons of damage. In teamfights, you'll want to be focusing vayne and whatever squishy champs the other team has.
But to get back to your question, the build can only do so much (you're using the right items), you'll need to focus on your strategy (target her first) to win.
%health true damage itself is tricky to deal with, but those chunks aren't as much of her overall damage as people tend to think (except in the case of actually tanky people). The usual armour/health still helps so the AA's themselves don't chunk you down as much, and it just becomes the w procs that cut you down, which can mean she needs a few more triggers of it than she might have otherwise.
That said, the key thing isn't to outtank her, so much as to catch her out. A pink can actually be quite useful to foil her when she's ulting and relying on the stealth to reposition, so consider having one of those on hand if you find she's using stealth to evade you.
The only defensive counter to it is Omen or frozen heart since they can reduce the rate at which Vayne can fire which in turn will reduce the rate at which she gets 3 shots off for % health true damage.
You don't build against it.
You play around it.
Though considering the champions that have it (Vayne, Fiora, Garen), armor and health will help you against the rest of their damage.
You need shields and 
Vaynes counter is
Funny huh
Boots.