Overview
Obsidia is a high damage dealer markswomen. The Queen of the Abyss. No one can escape from her. Fear to the Queen.
Strengths
Obsidia having high damage capacity at the late game but if you reach it. Her ultimate throws a bone shard over a long distance, and if it hits an enemy hero, it lodges in them and brings Obsidia closer, and closing enemy DASH skills. Obsidia is powerful when game reaches late game which means minute 15 or higher. Using critical build is the most accurate thing because of high damage output against most of the heroes. You can ult enemy jungler when they're alone, easily kill whenever someone is alone and guide your team to win one more step closer.
Weaknesses
Obsidia's weakness is her fragility; her low health and armor make her a target for any hero with burst damage and chasing abilities. Most marksmen can easily crush Obsidia in lane, especially Hanabi. Always supporting Obsidia and avoiding her to die is the best contribution you can make to her and the game's progression.
Critical Burst Build
This is the build you can wipeout enemy squad with inspire. Even squishy heroes gonna take one hit from Obsidia. But if the enemy have high regen or shield abilities, change Sky piercer to Sea halberd, if you took down by enemy more times then 2 change Sky piercer to Midas item this same goes to if enemy has a lot mage heroes. Also you can sell your boots when reaching late game and buy another defensive item like İmmortality or Winter crown to survive enemy ambush or enemy assassin.
Assassin emblem
Assassin emblem set is known by high penetration which Obsidia needs, high penetration plus critical build should make Obsidia more aggressive and high damage dealer, but if you want to also stay on foot in teamfights choose fighter emblem.
Battle Spell
Inspire is the best if you want to deal very high damage in seconds, but if enemy has high chasing or burst damage or high control abilities, choose Flicker/Aegis/Purify one of them.
Teamwork is important.
Obsidia is a fragile female marksman, so she'll be quite weak in the early game and likely to get one-shot in the late game. Therefore, I prefer using Aegis or Flicker. Regardless of the early game situation, I recommend playing without being aggressive towards the enemy, waiting for your team to come for support, attacking when they arrive, and quickly clearing the first three items before engaging in team fights. If you're under heavy enemy attack in the early game, switch places with a hero in the Exp lane and farm calmly there, and you can get defensive items. Sky Piercer isn't a crucial item for this build; remove or replace it only if you're at risk.
Best With Lolita
Lolita can protect and escort Obsidia with her shield, so taking a tank alongside Obsidia would be the most logical choice.
Watch Out For Hanabi
Hanabi's ultimate ability, Higanbana, can pin Obsidia to the spot and grab her like a fly swatter, especially since Helcurt, an assassin, can one-shot Obsidia, so you need to play carefully and pay attention to the map.