Tryndamere abilitypower is BEST sustain of lol.
-Bloodlust 150% on ap.
- Easy farming with spinning slash 100% on ap, killing range minions and later melee minions too in one hit.

With this build you have high burst damage, high sustain and great farm.

Full AP runes, more ap means bigger heals and damage, no need for armor.

just heal and its k.

Rush forlich bane, because you need that damage.
You'll need hp after lvl 6 so its possible you have to go for giants belt after lich bane.
Who needs boots? If you need the gold, leave the boots for later.

First level 1 bloodlust, then max spin for the damage. You dont need to level bloodlust because you heal the most with your ap. Maybe max mocking shout before bloodlust for teamfights.

Flash for safety and killsteals with spin.Ignite for the damage and additional ap.

Go full ap, poke alot. Buy giants belt for hp after lv 6.
In early game your basic attacks deals lots of damage, easy to get rage because of spin.

Notice that this build is good till late game (35min), but because you have lots of farm you can change to ad.

+ High sustain ( 1000+ heals every 6sec! )
+ No mana
+ Nice damage
+ Good farm

- Late game 35min + (change to ad)

Excellent farm with
Spin to get full rage instantly, poke enemy with spin hit and lucky crit.