Mateus is a dude too. xD
This battle was VERY easy for me because I had two Demonsbanes at this point =]
IF you beat the FIRST Demon Wall, you can access a secret section of the tomb which possibly leads to a chest (soft reset if you don't see it) and this chest potentially contains a Demonsbane (59 ATK if I'm not mistaken) which gets you dealing about 500 dmg at this point in the game (which is pretty whoa). The chances as I remember are about 1 in 6, and the chest respawns (which is why I had three) so it's not even that annoying. But beating the first Demon Wall means getting very lucky with Quickenings.
im already doing 500-700 damage by now
Then you'll do even more with a Demonsbane. Unless all your weapons are 59-ish ATK
ur jus weak i dont even hav the dust shard yet an im on lvl 20...train man
Also, Shiva is an Esper in FFXII:RW. Shiva and Mateus are not the same creature, just as Belias is not Ifrit and Addramallech is neither Ramuh nor Quetzacoatl.
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I believe Shiva would be the female attached to Mateus' body...