
Vindicta is located in the southwest area of the Heart.
The easiest ways to get there are using a Heart teleport (if you completed the miniquest "Tales of the God Wars") and teleporting to Nardah with a Desert amulet (2 or above) and running west from Nardah's bank.
To enter the fight you need 80 attack and you have to get 40 Zarosian kc.
Vindicta has 200k lp.
The fight is divided in 2 phases:
- Phase 1
Vindicta uses melee (mostly) and ranged attacks. Her only special ability is calling on her dragon Gorvek (raising her swords in the air) that will unleash dragonfire (purple smoke thingy). The dragonfire can be avoided moving aside when she raises her swords.
- Phase 2
Once Vindicta has 100k lp left, she will mount Gorvek. During this phase she follows this attack pattern: melee attack + ranged attack + melee attack + dragonfire and repeat.
The ranged attack hits hard. It is advised to switch between praying against melee and ranged and use devotion or debilitate.
Gorvek will unleash the dragonfire after flying away and touching ground somewhere. To avoid the dragonfire simply move aside once your character starts running toward the boss.
You can use whatever combat style you prefer. I usually go there with ranged just because I like it

During the fight you should pray against melee and switch to pray against ranged when needed.
Antifire potions don't work against the dragonfire.
Here is a link to a guide on the boss: http://runescape.wikia.com/wiki/Vindicta/Strategies