oscar has to be promoted in order to rescue mordecai. he's the only available unit able to do this. if he's unpromoted, 1090 is the best possible result using a different strat: https://youtu.be/w0bqLO150VQ
if oscar is promoted, he can even grab sephiran and escape on turn 13. this allows every unit except kieran to escape and results in 1090 bexp: https://youtu.be/3RpJxnLMLl4?t=328
in terms of reliability, all our hit rates are 100 thanks to the forged iron lance. titania faces ~50 hit (varies slightly on every attempt) from each of the three enemies she faces. even with the vulnerary she can die if she gets hit by everything, but that is rare.
this is played in fixed mode. titania's level up is just her being the best.
7:54 use the d pad to trade with volke instead of titania
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