
Impale
Rock spikes burst from the earth along a straight path. Enemy units take damage, then are hurled into the air and stunned.
Abilities, roles and builds with an explanation for every purchase.

HERO GAME PLANI find a squishy target from fog and use Spiked Carapace against suitable damage.
Nyx Assassin is always hunting for fragile targets. Sneaking invisibly through the forest, when he spots his prey, he swipes them with his deadly claws and impales them on stunning spikes, then reverses any counterattack with his reflecting carapace.
My recommendation is a starting point. We choose another position together with the team and for its needs.
I contribute through laning, control and movement. I adapt the expensive core route to my budget.
My resource is the team's space: I hold the lane and build for initiation or team protection.
This is an editorial starting plan based on hero mechanics. It is not presented as a match I have already tested or a popularity ranking.
Here is my initial plan: I do my role's job first, then choose the items the team needs. I adapt the order and expensive purchases to the opponent.

Provide mana for laning and regular ability use.

Adds quick magical burst against a squishy target. I get it when there are real openings for that kind of kill.

Changes the entry angle and lets me reach a target quickly. Damage taken can prevent its use.

Creates a window for magical burst or protection from attacks; I coordinate its use with allies’ physical damage.

Unlocks or upgrades Burrow. The exact effects are shown below in the abilities section.

I do not assign one ‘correct’ minute to every purchase. I look at my gold, the next fight and the problem: am I missing mana, target access, control or protection? If an expensive slot will arrive too late, I get a useful answer earlier.
Original Valve icons and descriptions. Cooldowns and mana are shown by level from the data snapshot; talents and upgrades can change the values.

Rock spikes burst from the earth along a straight path. Enemy units take damage, then are hurled into the air and stunned.

Deals damage to the selected enemy proportional to its maximum mana and burns a portion of that mana. Also repeats a portion of the damage the ability’s owner dealt to the target over the last 15 sec.
Deals damage to the selected enemy proportional to its maximum mana and burns a portion of that mana. Also repeats a portion of the damage the ability’s owner dealt to the target over the last 15 sec. The accumulated damage counter resets when this ability triggers.

Fully blocks damage from an attack or ability, reflecting damage and stunning each attacker once. Does not break the invisibility from Vendetta.
When activated while above ground, Spiked Carapace reflects and negates damage dealt to Nyx Assassin (max once from each source), as well as stunning the source of the damage. Activating Spiked Carapace will not break Vendetta invisibility. While Burrowed, Spiked Carapace instantly stuns nearby enemies when cast.

Makes the hero invisible and increases his movement speed. Attacking from invisibility deals massive bonus damage and applies break to the target.
Nyx Assassin becomes invisible and gains a speed bonus. If Nyx Assassin attacks to break the invisibility, massive bonus damage is dealt with the attack that applies a break to the target. Nyx Assassin has 75 additional attack range and a 70% faster attack animation for this attack.
Reduces cooldown by 10 sec. Grants the owner unobstructed movement and maximum movement speed for the first 15 sec.
These abilities are not necessarily available at the same time. I check the condition beside the name: innate ability, another form or an Aghanim purchase.

The hero quickly burrows into the ground. While underground, he is invisible, takes reduced damage, and has enhanced abilities: Spiked Carapace affects all nearby enemies, Mind Flare and Impale gain increased cast range, and Impale…
Nyx Assassin buries himself beneath the battlefield over a short duration. Once burrowed, Spiked Carapace instantly stuns nearby enemies when cast, the range of Mind Flare and Impale is increased, and Impale's cooldown is decreased. While burrowed, Nyx Assassin is stationary, unable to attack, and invisible. Nyx Assassin gains damage reduction from all damage sources.

Nyx Assassin's damage on enemies also burns mana as a percentage of the damage dealt.
Nyx Assassin's damage on enemies also burns mana as a percentage of the damage dealt.
These are fields from the official source. The hero's final values in the client account for attributes and other active mechanics.
Items, slang and real episodes help connect abilities with what happens in a match.