21 on defense > immortal singed

9 on utility > to use you poison without problem with mana

Glyph of Intellect >
Singed needs mana to do anything on lanes, poison spent maaaaaaany mana, and u passive skill grants to u 1HP to 4mana u have... u have more 101 mana total > + 25hp [passive]

Seal of Clarity >
Mana regem... poison, adesive and fling spent mana, u need more mana regen to lanning more...

Mark of Insigth >
More damage to Poison and Fling, ur kill more fast ur enemyes

Swiftness >
More mov speed, enemyes don't run from u so easy and u kill so easy on chases...
combinate ur speed with u slow, wow :P
have fun

Poison >
always on :p

Mega Adesive >
basically: slow, fling, kill :p

Fling >
awesome skill to help on team batles and kill noobs, u choice... fling on ur turret, on ur mega adesive, fling to ur team, fling to save allyes, is very useful on battles.

Insanity Potion >
More all stats pratically, AD, AP, mov speed, mana and health regen, armor, mr, atack speed.
with this skill, really, go without fear and kill ur enemyes

Bots of swiftinnes >
mov more fast, fling more easy, victory without problems.

Catalyst the protector > Rod of Ages >
Singed really needs mana, rod of ages supply mana, HP and AP!

Force of nature >
Before rod of ages, i think on MR... this iten, to me is obrigatory to singed too!
more mov speed, MR and health regen

Zhonya's Hourglass >
AP and Armor, the best iten to mid game i think... sunfire cape is good too!

Lich Bane >
Other awesome iten to singed... MR, mana and mov speed
and sheen, pratically, you kill enemy before fling :D

Rylay's Crystal Scepter >
Health, slow and ap...
u need more ?

SINGED IS LEGENDARY.

Sorry about my english
i'm brazillian

DELKING.