Understand its 4 stats

Why: each damage type depends on a stat — knowing this helps you choose what to raise.

What helps directly

Keep in mind

Strength

Increases physical damage (basic attacks). The Warriors' stat.

WhereMight of Valyria research + stars/level
Keep in mind

Instinct

Increases tactical damage and reduces physical damage taken.

WhereConqueror's Instinct research + stars/level
Keep in mind

Intelligence

Increases fire damage and reduces tactical damage taken.

WhereWisdom of Valyria research + stars/level
Keep in mind

Initiative

Decides who strikes first and reduces fire damage taken.

WhereFirst Flame research + stars/level