Chainers

Cloud triple slash will do x2 chain

Ramza triple hit skill creates a 2x elemental chain, whether they die from first hit or not.
If needing a 3x chain, just have another slasher hit first, or another white element slasher hit first to jeep element chain

I use Mont and a frees Mont and use Rock throw. Or sny two monks of the same element to use Pummel which hits 2 times.

Just get ur thancred and your friend's thancred and hit your englebert with keen edge. However, you need to time it such that the turn rotation goes such that 2 Thancred can hit ENglebert with Keen's before Engle's turn

for Slashing and Light elemental damage
use Thancred's Keen Edge ability

if opponents die on any of your attacks just bring a tank like unit

I hit Englebert with Keen Edge and Slashing and Light elemental damage then I get the 2 Chain quests