Overview
Obsidia is a marksman that shines midgame to lategame so in order to farm fast, her priority lane should be Gold lane. Her ultimate can countered dash dependent heroes.
Strengths
Her main strength comes to her passive and ultimate, Ofcourse her 1st skill also help her with her passive to fill up so always stack up your passive first when initiating a fight early. And her 2nd skill is kind of dash so it will help you to reposition yourself and outplay most of enemies as long as you're playing safe.
Weaknesses
Obsidia's weaknesses are her early game capabilities, she lacks damage so in order to cover for that support and core must assist her during early game phase.
TRINITY BUILD WITH ITEM SWITCH
Here's a trinity build that is so super effective to her playstyle because of how quickly she can stack this item and abuse their passive. As for your defensive item you can always change Wind of nature to rosegold or immortality or frozen.
FAST ITEMIZATION and for dueling enemies marksman
Thrill for adaptive attack Bargain hunter so you can purchase your early game item fast and it also contribute to lategame when you're planning to switch item such us immortality,frozen and rosegold Weakness finder because of how easily Obsidia can proc this emblem due to her passive that can attack and proc many times.
Battle Spell
Honestly it's up to your playstyle and enemies on which spell you should use but if you're playing safe and defensive early to midgame, Aegis is a good choice of spell. Due to your role being Mm enemies with burst capability, they always wanna snipe you first so always observe your map.
MIDGAME TO LATEGAME
Obsidia's power comes to her item so her power spike is when she hit her 3 core items which is the Trinity build so play safe and farm your core item first before joining the fight
Best With Angela
Angela is a good partner for her because of how quickly Obsidia can initiate a fight and Angela can help her whenever she engaged enemies.
Watch Out For Yi Sun-shin
As long as you have items and you hit her with your ult you can easily counter Yss