Tip: Destory as many wards as you can, since u gain health from your w, Try to farm here and there so you end up having more hp. One of best supports to fast clear wave if your teammates cant for w/e reason at that moment. Have more than 100 games with Sion as support, and countless more with him at any role. Hope you will enjoy my build.

GLORY IN DEATH (Passive): Upon taking fatal damage, Sion briefly becomes invulnerable then enters a frenzy, restoring himself to full health but begins to drain (1 + level) health for the first tick and increasing by (0.7 + (0.7 x level)) health per tick. Sion can freely move and attack during this time, gaining 100% lifesteal, attacking at 1.75 attack speed and dealing 10% of his target's maximum health as on-hit physical damage (capped at 75 bonus damage against monsters).

Additionally, Sion gains the ability to cast Death Surge using any learned ability.
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DECIMATING SMASH (Q)
Range: 600
Cooldown: 10 / 9/ 8 / 7 / 6
Cost: 45

First cast: Sion starts channeling, increasing the damage of Decimating Smash over the next 2 seconds. If Sion's channel is interrupted by crowd control, Decimating Smash will have a reduced cooldown.

Second cast: Sion smashes his axe into the ground, dealing somewhere between a minimum of 30 / 50 / 70 / 90 / 110 (+0.45 / 0.525 / 0.6 / 0.675 / 0.75 per attack damage) and a maximum of 70 / 135 / 200 / 265 / 330 (+1.35 / 1.5 / 1.65 / 1.8 / 1.95 per attack damage) physical damage in an area in front of himself - depending on channel time - and briefly slowing enemies hit. If he charges Decimating Smash for at least 1 second, enemies hit will also be knocked up for a minimum of 1.25 seconds, up to 2.25 seconds if Decimating Smash is fully channeled. Minions take 60% damage.
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SOUL FURNACE (W)
Range: 550
Cooldown: 15 / 14 / 13 / 12 / 11
Cost: 65 / 70 / 75 / 80 / 85

Passive: Sion permanently gains 4 bonus health whenever he kills a unit, increased to 15 against large units and champion kills and assists.

Active: Sion surrounds himself with a shield that absorbs 50 / 75 / 100 / 125 / 150 (+40% of ability power) (+8 / 9 / 10 / 11 / 12% of Sion's maximum health) damage for up to 6 seconds. After 3 seconds, Soul Furnace can be recast to detonate the shield if it hasn't been destroyed, dealing 40 / 65 / 90 / 115 / 140 (+40% of ability power) (+10 / 11 / 12 / 13 / 14% of target's maximum health) magic damage to all nearby enemies. Bonus damage from the target's maximum health is capped at 400 against minions and monsters. The shield will detonate automatically if it persists for the full 6 seconds.

Soul Furnace can be activated and detonated while using any of his abilities.
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ROAR OF THE SLAYER (E)
Range: 725
Cooldown: 12 / 11 / 10 / 9 / 8
Cost: 35 / 40 / 45 / 50 / 55

Sion bellows in the target direction, dealing 65 / 100 / 135 / 170 / 205 (+55% of ability power) magic damage to the first enemy he hits, as well as slowing it by 40 / 45 / 50 / 55 / 60% and reducing its armor by 20% for 4 seconds.

If the target is a minion or non-epic monster, they are knocked back 775 units, dealing the same damage and applying the same effects to all enemies they pass through. Projectile enemies stop upon colliding with terrain or reaching the end of their trajectory.
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UNSTOPPABLE ONSLAUGHT (R)
Cooldown: 140 / 100 / 60
Cost: 100

Sion charges in the target direction for up to 8 seconds, during which time he cannot cast abilities nor attack, but is immune to all crowd control effects. Sion's trajectory will update toward the mouse cursor over the duration, but his rotation speed is significantly slow.

If Sion collides with an enemy champion or terrain, charges for the full 8 seconds, or recasts the ability, he will slam the ground with earth-shattering force, dealing a minimum of 150 / 300 / 450 (+0.4 per bonus attack damage) physical damage and knocking up enemies nearby enemies, while slowing enemies further away. The base damage and crowd control duration increase over the first few seconds of the charge, capping at 400 / 800 / 1200 damage and 1.75 seconds respectively.