The Velius battle ultimate strategy is to hgave a summoner with lich casting lich every turn, I don't think lich always hits but Velius takes 500ish damage every time. If thats unavailable then try having a group of lancers rapidly jumping on Velius as they cannot be hurt while in mid air and take little damage this way. OR a great thing for the Weigraf part as im not sure if it continues into the Velius part is to hjave Ramza yell alot while healing when needed untill he gets to go around 5 times everytime each unit goes once. There may be better ways I guess but this is least time consuming then using yell/accumulate for like a half hour.