Hmm, what other princesses do you have other than Olivie? Maybe you should follow Lackages's guide where he placed Katie at the top right and then Iris. That way, Iris will heal herself as the lich targets her and Katie can survive at AW60+. If Olivie is the only high level princess you have, you can use Thetis to block the first lich. Lackage used AW'ed Sherry because she buffs gold units and because she has an attack multiplier skill. Thetis should be a good replacement for her since she has 10 MR (same as Sherry) and increase attack IV (1.9x at max skill which is slightly better than Sherry's 1.8x). The only problem with using Thetis over Sherry is Thetis deals physical damage and Sherry deals magical damage so it will take Thetis slightly longer to kill the lich. But with Elizabeth, that shouldn't be a problem...I think. Idk when you joined, but if you have Claudia, place her in the same place Lackage did. As for burst units, I would try using Elizabeth first and if that doesn't work, use Nanaly. Keep in mind that my Nanaly had max skill so her CD was shorter.