So, the Thagomizers. Gives an extra melee charge, and grants the Amplify subclass node for free. -snip, i was wrong- I don't think the Thagomizers are worth an Exotic slot with those perks, especially in PvP. If I have big, spiky arms, you know what those big, spiky arms would do?
Hurt.
So, my suggestion would be, instead of Amplify and an extra melee charge? Discharge and 50% extra melee damage against Minions of the Darkness. (10% extra melee damage vs. Guardians.)
Or, maybe instead of Amplify increase the melee Overload proc chance by half.
TL;DR
Thagomizers aren't cool enough.
Give them extra melee damage and Discharge as a free perk, or increased Overload proc chance.
[spoiler][i]boy, i made a fool of myself.[/i][/spoiler]
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The problem with this is that most guardians would use over load and one shot high armor guardians as well as low armor guardians. People would not stand for this. It would probably lead to another Titan nerf and we don't want that.