first you need to set a item in your nexus core that’s in your territory, so does the enemy which’s nexus core you need to defeat by killing the item in it and taking the spot of the nexus core with a item. and yes, if the nexus item is mobile, the nexus core can move along with the item.
second we need to establish that the • is the super attacking position and • is the super defending position, || || is the border between the two territories. each has a use, the super attacking position to put items in and double the damage output, the super defending position to double your current hp, and the border for passing through to the foe’s land and putting in walls to keep building your defense. the tiles with no symbol can use both a attack and defense, but weaker than their super position counterparts.
thirdly, as the players take turns they deploy items (only 1-3 of the same items in one turn) and attack their enemies nexus item, they can also combo items for new ones or use consumable items to destroy enemies and strengthen yourself.
fourthly, after 3 turns the players can pass through the barrier to eachothers territory
with all these rules in place, just make sure to have fun!