Glad to see you`re progressing , but also sad for bumping in so many problems. Ideas for implementing tomes and then `developing` them during game into more powerful items are great, and sadly undoable as you said.
Weird thing about different game mechanics for spells/items ... in the Legend / Ap-Cw / WotN. All 3 are made on same basics but many thing in game itself are very different. It does not make any sense
Item having more then 10 params seems a bit much, but i guess it`s logical to add new param after every upgrade and keep old ones. It wasnt done that way for some items so far : Dragon toy in Cw (you gain 15% dmg for rage skill dmg but lose bonus for mana accelerator, and wall upgrade from separate items).
And having hero in tome upgrading/suppressing battles not necessary because towers already cast spells and more then one/turn. It`ll be like 1 more very strong tower with larger list of spells, and some passive bonus for troops in battle. Maybe you dont need to lose time on making this work.
Good luck in further work Matt
