Slark + Templar Assassin

Why this works

Fighting for the same resources slows both heroes down considerably. Slark and Templar Assassin are both tempo cores who need to get ahead by killing heroes in the mid-game. They hunt similar targets, want to farm the same aggressive parts of the map, and need the final blow to power their own scaling—Slark for Essence Shift stacks, and Templar Assassin for gold from solo kills. Their kits don't offer much to each other either. Neither provides the kind of reliable, long-duration lockdown that the other needs to secure a difficult kill; they mostly overlap.

This conflict means the game often feels like a race where only one of them can win. If the team's resources are split, both heroes can fail to hit their crucial item timings. Opponents can exploit this by grouping up early. With both cores focused on single-target physical damage, the enemy team can build defensive items like Ghost Scepter and simply push together as five. Lacking teamfight control or significant magic damage from these key roles, your lineup struggles to defend high ground or contest objectives.