OK.
Basic getting there:
-standard margonite combat should give you no trouble
-shiroken pass: just run through, and you'll only have to deal with three shiroken that follow you - piece of cake
-portals: take your time, and remember that some patrols respawn while others don't. So, isolate the permanent patrols (I think the all titans are non-respawnable), and once only the repeating patrols remain, make quick hit and run strikes against the portal wraiths. Remember that they blind you! Suggested order:
1: kill the right outer group, retreat, clear the patrols,
2: right inned group, retreat,
3: draw the titan abomination patrols away from the wraiths and kill in isolation,
4: kill the left outer group, keeping away from the torment claw (or interrupting it's skill), clear the center patrols,
5: go back to the right and draw out the fire titan, killing him alone
6: get the last two groups of portal wraiths
Shiro and Lich (my way of doing it):
-run in, kill lich first (I hear holy damage works nice), ignore shiro completely
-activate all the altars, clearing the margonites
-have ONE melee character total tank Shiro. Armor is not really important - get something that blocks attacks instead. Flashing blades of the assassin class are ideal. Have the melee character use nothing skill wise, except wild blow to break the battle scars
-depending on what you have with you wait a long or short time until Shiro croaks
