Think my thoughts about Album and Burning for XP, might fit better in this tread, so will add it here. I would 100% support some sort of "burn" to gain XP, especially if we are looking to promote the "card opening" for gathering Illuvials.
I think the Album/Repository, with a leaderboards/rewards, is one of the most important elements that are currently missing.
If this was implemented in similar way as we have it for Illuvitarts with the Beyond Leaderboard Rewards. (and was also tested to some extend in the “test phase”). we could make a system that both incentivises collecting and “burning” more Illuvials. One way it could work:
Your Illuvial has a base point based on Tier and stage, with added multiplier for power level (Traits + level). you collect them in albums and get bonuses for completing sets. you would collect both Normal , Holo x2 points and Dark Holo x3 points.
The points you get is 100% for Illuvials that you catch or obtain from drone runs/opening packs, and from fusing, and you get 70% of the points from Illuvials you buy from the marketplace. (still worth buying high stats Illuvials from the marketplace, but you get rewarded for collecting or fusing them yourself, and it can encourage fusing which is the one “burn mechanism” that already exists).
You can gain XP for your Illuvial by bringing them with you in the OW, fighting in Arena, and by “sacrificing” (burning) an Illuvial of the same type. (you would gain XP equal to powerlevel *10 for the “sacrificed” illuvial, and there would be a max level you can gain by this method)
I think this would make a good foundation for wanting to collect but keep improving the collection. and make a use for Illivials both for fusing and gaining XP.