Lol...did you get the recording to show it?  I do recall seeing an Eradica phase jump in right after yours died (kind of like insurgency)...but then I never actually say it...

Yep, it died with Unyielding Will selected. No invisible titan or anything, just gone. That whole tactic failed because of the glitch

5 levels down on your titan means you may have a tough time.  That said here are some tips on fighting the Eradica:

1).  First rule of killing late game advent fleets: The Progenitor Motherships die or get chased off first.  If you don't deal with these buggers they will making killing anything else take unnecessarily long.  if you see one using it's AoE shield restore try to interupt it.  Killing progens first is doubly important against Advent Rebels as it shuts down their malice combos

2). Kill it's supporting fleet before Eradica.  It's only form of healing which is unique to it is it's ability to sacrifice it's own frigates for a large heal.  If the Eradica has no supporting frigates it has nothing to munch on.  Don't worry about Strength of the Fallen too much in huge battle- The Eradica is going to get it's 5 stacks regardless with that much firepower flying around, better to kill it's supporting fleet then focus it and have it gain it's stacks by sacrificing it's own frigates to outheal your damage output. 

3). Against a high level Eradica don't bother with non-Carrier combat frigates.   High level Chastic Burst(the Eradica's signature AoE ability) along with the Eradica's powerful weapons systems means frigates within range of the Eradica will die en-masse before causign much harm.  The only real defense frigates have from a high level eradica is to stay out of range- and Carriers are the only frigate that can attack while running away.  Not to mention Carriers are the beefiest frigates anyway and can last much longer when they are cornered then other frigates.  Note I say combat frigates though: you'll still want utility/support frigates along for the ride- heck If you're massing bombers as vasari having a few subverters around to get extra phase missile bypass chance is a must.  The only exception is you may want to have some LRF in reserve in case the advent player tries to chase down your carriers with Light frigates- But these LRM frigates should not be left toe-to-toe with the eradica while you wait for a LF detachment.

4).  This is really a continuation of #3, but load your carrier frigates with bombers.  Once engaged if the Eradica chases, keep your carrier frigates in motion so that the Eradica doesn't catch them.  If the Eradica gets close, exploit the carrier frigate's superior mobility to create some distance. 

5).  When the Eradica turns blue, it's time to go.  Retreat immediately- you've already killed the beast and have no interest in getting caught up in it's death throes.

6).  Make sure you have phase missile research done and if possible don't fight key battles in advent culture

Well I looked again and my titan is level 1. So um, I gave up on that game

Lol, Kyle must be our newest troll...

Wait, who is it who's pathetic?

Ugh...first Human Lenin, now Kyle...no class, not funny, not even skilled...I miss the old trolls....Mecha and Qu4r, please save us....

I just lost LVL 10 eradica titan.

To be fair it died pretty fast against advent loyal

I posted reply of it on forums

https://forums.sinsofasolarempire.com/429367

and yes it was intentional, I suicide it to get ultimate and to rape enemy fleet

Lol...Zombie did that once...but it glitched and the lvl 6 didn't activate...

The AI is pretty stupid. Try Kiting the Titans into minefields, and turret range. I am surprised phase missiles aren't having much of an effect since advent are all about shields. Phase missiles should be doing some major damage. I never had to fight a lvl 10 Eradica so this info is good to know.

Edit: Oh man this is what i get for hitting reply before i finish reading the walls of text.

True, but the phase missile block is rather worthless...

Naw- It's kind of weak because phase missile block is a multiplicative modifier using sins math.

20% phase missile block only reduces 30% shield bypass chance down to 25%- and 25% is still far more then enough to render the advent's biggest source of damage mitigation(shield mitigation) impotent and kill their ship's hull LONG before their shields even come close to dropping. And that's before Shield diruption comes into play(shield disruption will negate that 20% PMB chance).

Frankly the advent needs to be able to drop enemy bypass chance to 15-20% for their defenses to even be *almost* as effective against Phase Missiles as other weapons(damage would still be dealt to hull, but in effect that other 82-85% of less important damage that doesn't penetrate is pretty comparable to what shield mitigation would absorb from other weapons).  But that would require 50-100% Phase missiles block(which is a ton).  Furthermore including Shield disruption that reduction would drop from dropping to  15-20% for 100% & 50% respectively to 17.7-23.1% respectively.

Honestly though, the real reason the Advent have so much trouble with phase missiles is they lack any widely available hull repair abilities.  Low armor & hull contribute too, but the biggest problem is they are mostly stuck with every hull damage they suffer(by contrast other factions getting 30/hull a sec or more outsustains a decent portion of incoming phase missile damage).  To be as capable at dealing with phase missiles as other factions they are either going to need to better hull repair options OR a substantial mitigation of shield piercing damage,  The current 16.66666667% damage cut(which is the equivalent of a 20% reduction in sins math) in culture just doesn't really cut it.

While it sounds very high I suspect advent techs should be grants a grand total of something in the area of +50% PMB.  This would result in about a 33% reduction in Phase missiles damage- which corresponds nicely to the roughly 33% reduction in damage the Advent's +10% shield mitigation from techs they receive against other weapon types types.  This could easily be accomplished by having both techs that currently give PMB in culture(the second two culture techs) having their bonus increased from 5/10% to 10/20% and adding +5/10% PMB in culture to Zealous worship(the first culture tech which previously has given no PMB).