You don't need to have 100 lp, because 100 lp gives you 500 da and no dmg gives you as well 500 da. so it makes no diffrent if you stay at 500 lp or if you decrase your lp to 100.
no damage is not possible with Elements Unite, since you already sacrifice 3500lp to activate the skill. so yes, if you can, better aim for 100lp. and in case of farming odion, yugi, rex, destroy his monsters as well to get bonus DA. not that it really matters though, since it's over 8k already.
u can if u use piranha combo, with UA, its not possible, big bang shot, is still battle damage, u have to pair it with vassal so the damage its taken as effect damage and be properly dealt.
Anoymous
Noobs